Dissertations / Theses on the topic 'ELISA tests'
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Casimiro, Angélica Maria. "Padronização e avaliação de método sorológico ELISA para detecção de anticorpos IgG anti-Cryptosporidium sp." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/9/9136/tde-06032015-145009/.
Full textThe aim of the present study was to standardize an immunoenzymatic assay, ELISA, for detection of IgG antibodies to Cryptosporidium sp for use in epidemiologic studies on cryptosporidiosis. For antigen preparation, oocysts were obtained from fecal samples of orally infected calves. A modified sucrose gradient, concentration technique was used for recovered and purification of oocysts, which were ruptured by using freezethaw cycles and ultra-sonication. Positive control sera were chosen among the Parasitology workers, who presented anti-Cryptosporidium antibodies and had been exposed to this parasite, because of their activities in the laboratory; and negative control sera were chosen among the ones with optical density (O.D.) readings lower than 0,300 at ELISA for anti- Cryptosporidium antibodies. Oifferent groups of sera from clinically normal individuais (parasitology workers, blood donors, pregnant patients) or with other parasite infection (cysticercisis, toxoplasmosis, schistosomiasis, Chagas disease, leishmaniasis) were evaluated for the presence of Cryptosporidium antibodies. The higher frequency was observed for the group of patients with Chagas disease (66.6%) and the lower frequency for the group patients with schistosomiasis and toxoplasmosis (20.0%). The specificity of the Cryptosporidium-ELISA test was demonstrated when significant reduction of the 0.0. readings was observed for some serum samples after absorption of the anti-Cryptosporidium antibodies. Also, in the group of pregnant patients, the high frequency of 52.0% for anti-Cryptosporidium antibodies when compared to the low frequency of 14.6% for anti-Toxoplasma antibodies might suggest possible absence of cross reactions between these two closely related parasite antigens. The ELISA for detection of anti-Cryptosporidium antibodies, as standardized in the present work, can constitute a good toel for epidemiological studies of cryptosporidiosis.
Costa, Thiago André Carreo [UNESP]. "Utilização da técnica de Elisa com proteína A e anti-IgG para o diagnóstico sorológico da Leishmaniose visceral felina." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/92206.
Full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O presente trabalho teve como objetivos estudar, em uma área endêmica para leishmaniose visceral, a soroprevalência anticorpos anti-Leishmania spp. em felinos, por meio duas técnicas de ensaio imunoenzimático (ELISA), ELISA-prot.A e ELISA-IgG, utilizando-se 200 gatos. Para avaliar a performance dos testes sorológicos utilizados no diagnóstico da leishmaniose felina, foram calculadas as especificidades e sensibilidades de cada teste, bem como o índice kappa (k) para cada um deles, com o intuito de avaliar a concordância dos métodos com o teste parasitológico direto (padrão ouro). Foram observadas formas amastigotas do patasito em 4% (8/200) gatos. Pelo ELISA-Prot.A, 4,5% (9/200) dos gatos apresentaram títulos acima do ponto de corte para a espécie e, pelo ELISA-IgG, 11,5% (23/200) dos animais foram considerados soropositivos. O ELISA-Prot.A apresentou sensibilidade de 12,5%, especificidade de 64,5% e concordância fraca com o teste parasitológico direto. O ELISA-IgG apresentou sensibilidade de 25% e especificidade de 19,2%, com índice kappa também indicando fraca concordância.
The present work aimed to study, in an endemic area for visceral leishmaniasis, the seroprevalence of Leishmania sp. infection in cats using two enzyme-linked immunosorbent assay (ELISA) techniques, ELISA-protein A and ELISAimmunoglobulin G. For this purpose, a total of 200 cats were employed. To evaluate the performance of the available sorological tests for the diagnosis of feline leishmaniasis it was determined and compared the sensitivity and specificity of ELISA-prot. A and ELISA-IgG, as well as the kappa index (k) for each one, to measure its concordance with the parasitilogical test (gold standard). Amastigote forms of the parasite were observed in eight (4.0%) cats. By ELISA-proteín A nine (4,5%) cats presented titer above the specie’s cut off point and by ELISA-IgG 23 (11,5%) were considered seropositive. The ELISA-proteín A was 12,5% sensitive and 65,4% specific, and showed a weak concordance with the parasitological test. The ELISA-IgG showed a sensitivity of 25% and specificity of 19,2% and when kappa index was analysed, a weak concordance was observed too.
Gonzales, William Henry Roldan. "Deglicosilação de antígenos de excreção-secreção de Toxocara canis e a sua aplicação no sorodiagnóstico da toxocaríase humana." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/5/5134/tde-02122014-085309/.
Full textSerodiagnosis of human toxocariasis is usually based on the detection of anti-Toxocara spp. IgG antibodies in serum samples by ELISA test using T.canis larvae excretory-secretory (TES) antigens. However, a cross-reactivity occurrence is observed in endemic areas of polyparasitism. Many studies have shown that the glycan structures, present in helminth antigens, can be the responsible for the cross-reactivity. In this study, we evaluated the deglycosylation of the TES antigens on the sensitivity and specificity of both the ELISA and Western-blotting for the detection of IgG, IgM, and IgE antibodies. For the deglycosylation of the TES antigens, they were treated with different concentrations of sodium hydroxide (NaOH) or sodium metaperiodate (NaIO4), and 58 serum samples of 58 patients with visceral toxocariasis, 75 serum samples of patients with other helminth infections, and 95 serum samples of healthy individuals. Our results show that the TES antigens were totally deglycosylated with 100 mM NaOH for 4 hours at 37°C (dTES), whereas not good results were obtained with sodium metaperiodate. The sensitivity and specificity of both TES and dTES antigens were 100% in detecting IgG antibodies by ELISA; the cross-reactivity observed with TES antigens (13.3%) was reduced (5.3%) when dTES antigens were used. All toxocariasis patients showed IgG antibodies against the five fractions of TES antigens (32, 45, 55, 70, and 120 kDa), but also with the 26-kDa single fraction of dTES antigens, with sensitivities and specificities of 100% for both antigens. The occurrence of cross-reactivity, observed mainly with the 32-, 55-, and 70 kDa fractions of the TES antigens, was totally eliminated when the dTES antigens were used. The detection of IgM antibodies by ELISA test showed unspecific reactivity in all studied groups, with sensitivities of 39.7% and 34.5%, and specificities of 95.8% and 96.8% for both antigens; the occurrence of cross-reactivity for both antigens were 24% and 28%, respectively. All studied groups have IgM antibodies against almost all fractions of TES antigens and the single fraction of dTES. The detection of IgE antibodies by ELISA test showed sensitivities of 63.8% and 62%, specificities of 100%, and occurrence of reactivity of 26.6% and 53.3% for TES and dTES antigens, respectively. The majority of the toxocariasis patients (74.1%) showed IgE antibodies against the 32-, 55-, and 70 kDa fractions of the TES antigens, whereas there was not reactivity in sera from patients with other helminth infections or healthy individuals. These results showed that the deglycosylation of the TES antigens reduces the occurrence of cross-reactivity in patients with other helminth infections, increasing the diagnostic value for the detection of IgG antibodies. However, this procedure does not improve the sensitivity nor reduces the occurrence of cross-reactivity in the detection of IgM antibodies. Likewise, this procedure does not improve the sensitivity in the detection of IgE antibodies by the ELISA test. On the other hand, the high specificity obtained in the detection of IgG, IgM, and IgE by Western-blotting suggest that conformational epitopes of the TES antigens may also be the responsible for the cross-reactivity in the ELISA test
Sato, Camila Massae. "Diagnóstico sorológico da leishmaniose tegumentar americana causada por espécies diferentes de Leishmania." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/99/99131/tde-22112017-105830/.
Full textAmerican tegumentary leishmaniasis (ATL) is caused by various species of protozoan of the genus Leishmania and comprises a group of diseases that present distinct clinical, histopathological and immunological characteristics. The diagnosis is performed based on epidemiological, clinical and pathological features, supported by positive parasitological tests and presence of delayed hypersensitivity to Leishmania antigens. The serological tests used to date have several limitations and therefore it is of great importance to identify recombinant proteins from Leishmania so that they can be tested as potential antigens for the development of techniques for the diagnosis of ATL. In this study, two highly conserved Leishmania recombinant proteins, Lb8E and Lb6H, derived from Leishmania (Viannia) braziliensis (Lb), were used, evaluating their ability to detect antibodies in the serum of several groups of patients by enzyme-linked immunosorbent assay (ELISA). Recombinant antigens detected 83.3% (Lb8E) and 100.0% (Lb6H) ATL patients, and 95.4% (Lb8E) and 89.4% (Lb6H) visceral leishmaniasis (VL) patients. These reactions with Lb8E and Lb6H were highly specific in healthy subjects. Sera from ATL patients infected with different species of Leishmania, prevalent in Brazil, (Leishmania (Leishmania) amazonensis, L. (Viannia) braziliensis, L. (V.) guyanensis and L. (V.) shawi) and samples from patients with other parasitic infections were evaluated for the presence of anti-rLb6H antibodies. In 219 ATL, the sensitivity was 100.0% e the general specificity, considering 68 healthy subjects and 213 patients with other infectious diseases. In addition, samples from other infectious diseases indicated a probable lack of cross-reactivity, as only a minority of samples from patients with Chagas disease had antibodies against rLb6H and all of these responses were low. Finally, the results suggest that the ELISA using rLb6H antigen may be considered for routine use for serological diagnosis of ATL.
Chubilleau, Catherine. "Optimisation de tests sérologiques de dépistage : exemple de la bilharziose : Intérêts et limites de la séro-épidémiologie des maladies infectieuses d'origine hydrique." Montpellier 1, 2004. http://www.theses.fr/2004MON13516.
Full textKnappik, Michael. "Aufbau und Evaluation eines NANP19-Circumsporozoitenprotein-Antikörper ELISA Tests zum Nachweis von Plasmodium falciparum Infektionen bei nichtimmunen Reisenden." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-156970.
Full textFernandes-Rouviere, Isabelle. "Caractérisation d'antigènes recombinants en vue du développement de tests ELISA discriminatoires de la fièvre Q chez les ruminants." Nice, 2009. http://www.theses.fr/2009NICE4008.
Full textLa fièvre Q est une zoonose, due à Coxiella burnetii. Les ruminants domestiques constituent la principale source d’infection humaine via l’excrétion de la bactérie dans l’environnement. Chez les ruminants, la fièvre Q peut provoquer des avortements. Différents tests sérologiques basés sur la reconnaissance de l’antigène total de C. Burnetii sont disponibles pour diagnostiquer la fièvre Q. Ils peuvent donner des résultats discordants et ne permettent ni de distinguer les différents stades et formes de l’infection, ni de distinguer les animaux infectés de ceux vaccinés. Compte tenu de ces limites, la recherche d'antigènes spécifiques répondant aux problématiques du diagnostic de la fièvre Q chez les ruminants est un challenge important. Lors de cette étude, des marqueurs de l’infection et de la vaccination ont été identifiés. La protéine HspB serait à la fois un marqueur d’infection récente et de réactivation de l’infection. La protéine AdaA, a été testée pour sa capacité à identifier un avortement à fièvre Q. Son utilisation en ELISA permettrait d’indiquer un avortement à fièvre Q. Cependant, une variabilité génétique a été observée parmi les souches de C. Burnetii étudiées : une duplication d’une partie du gène, chez certaines souches, a pour la première fois été observée. Un marqueur de la protection vaccinale chez les caprins a également été identifié : la protéine 27kDa OMP. Concernant l’excrétion bactérienne, des marqueurs de celle-ci ont été mis en évidence. Ces antigènes sont en cours d’identification par via une puce de protéines de C. Burnetii. Les résultats obtenus ont permis d'entrevoir des pistes dans le développement de tests pour le diagnostic de la fièvre Q animale
Frössling, Jenny. "Epidemiology of Neospora caninum infection in cattle : evaluation of diagnostic tests and herd studies /." Uppsala : Dept. of Ruminant Medicine and Veterinary Epidemiology, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/v175.pdf.
Full textBrander, Patricia. "Entwicklung eines ELISA-Screening-Tests mit dem genus-spezifischen Anigen Wijnberg zur Diagnose der Leptospirose bei Rind und Schwein /." [S.l : s.n.], 1987. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textCosta, Thiago André Carreo. "Utilização da técnica de Elisa com proteína A e anti-IgG para o diagnóstico sorológico da Leishmaniose visceral felina /." Araçatuba, 2008. http://hdl.handle.net/11449/92206.
Full textBanca: Valéria Marçal Felix de Lima
Banca: Márcia Dalastra Laurenti
Resumo: O presente trabalho teve como objetivos estudar, em uma área endêmica para leishmaniose visceral, a soroprevalência anticorpos anti-Leishmania spp. em felinos, por meio duas técnicas de ensaio imunoenzimático (ELISA), ELISA-prot.A e ELISA-IgG, utilizando-se 200 gatos. Para avaliar a performance dos testes sorológicos utilizados no diagnóstico da leishmaniose felina, foram calculadas as especificidades e sensibilidades de cada teste, bem como o índice kappa (k) para cada um deles, com o intuito de avaliar a concordância dos métodos com o teste parasitológico direto (padrão ouro). Foram observadas formas amastigotas do patasito em 4% (8/200) gatos. Pelo ELISA-Prot.A, 4,5% (9/200) dos gatos apresentaram títulos acima do ponto de corte para a espécie e, pelo ELISA-IgG, 11,5% (23/200) dos animais foram considerados soropositivos. O ELISA-Prot.A apresentou sensibilidade de 12,5%, especificidade de 64,5% e concordância fraca com o teste parasitológico direto. O ELISA-IgG apresentou sensibilidade de 25% e especificidade de 19,2%, com índice kappa também indicando fraca concordância.
Abstract: The present work aimed to study, in an endemic area for visceral leishmaniasis, the seroprevalence of Leishmania sp. infection in cats using two enzyme-linked immunosorbent assay (ELISA) techniques, ELISA-protein A and ELISAimmunoglobulin G. For this purpose, a total of 200 cats were employed. To evaluate the performance of the available sorological tests for the diagnosis of feline leishmaniasis it was determined and compared the sensitivity and specificity of ELISA-prot. A and ELISA-IgG, as well as the kappa index (k) for each one, to measure its concordance with the parasitilogical test (gold standard). Amastigote forms of the parasite were observed in eight (4.0%) cats. By ELISA-proteín A nine (4,5%) cats presented titer above the specie's cut off point and by ELISA-IgG 23 (11,5%) were considered seropositive. The ELISA-proteín A was 12,5% sensitive and 65,4% specific, and showed a weak concordance with the parasitological test. The ELISA-IgG showed a sensitivity of 25% and specificity of 19,2% and when kappa index was analysed, a weak concordance was observed too.
Mestre
Maalouf, Rita. "Sélection de fragments d’anticorps dirigés contre les microcystines pour la mise au point de tests d’immunodétection." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2424/document.
Full textCyanobacteria are ubiquitous microorganisms that present a worldwide concern to public health authorities because of the toxicity of the cyanotoxins they produce. Some cyanotoxins are hepatotoxins such as microcystins (MCs). At least 200 variants of MCs have been identified till today. In our study, we focus on MC-LR, a monocyclic heptapeptide (cyclo-(D-Ala-L-Leu-D-erythro-β-methylAsp-L-Arg-ADDA-D-Glu-N-methyldehydro-Ala), since it is the most frequently detected and one of the most toxic. In our study, we are interested in developing a fast, sensitive and reliable method to detect MCs. The project aims to develop an alternative pollution detection method that would be better suited to field measurements than the physicochemical methods currently available. The originality of this project lies in the use of two different approaches to select a panel of antibodies suitable for the development of immunodetection tests. The first one is based on the hybridoma technology for the production of monoclonal antibodies. The second one is based on phage display technique to select antibody fragments that are specific to MC-LR from a library of approximately 109 phages, expressing on the surface scFv fragments (Shahsavarian et al., 2014). Two monoclonal antibodies were selected using the first approach, and their specificity was evaluated using ELISA technique. Along with three scFvs selected from phage display approach. An additional scFv was added to this list: 3A8, selected from a previous study (McElhiney et al., 2002) and also specific to MC-LR. The scFvs were cloned into an expression vector in order to get each clone in its scFv soluble form. Then, their specificity to MC-LR was evaluated using ELISA technique and Surface plasmon resonance. The results show a potential specificity to MC-LR. Nevertheless, these results are not very reproducible and call into question the refolding protocol used. A thorough work on this protocol optimization would be necessary, in order to find the key parameters that control the loss or gain of their functionality
Rolland-Turner, Magali. "Développement d'un vaccin immunocontraceptif : mise au point de tests immunologiques dans le modèle vulpin et développement de vaccins ADN avec les antigènes spermatiques fSP13 et fSP8." Nancy 1, 2005. http://www.theses.fr/2005NAN11303.
Full textAroussi, Abdelkrim. "Détection de l’ADN de Toxoplasma gondii et évaluation des performances de deux tests sérologiques dans la viande équine vendue dans les supermarchés en France." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0026/document.
Full textIn France, some cases of severe toxoplasmosis have been linked to the consumption of horse meat that had been imported from the American continent where atypical strains of Toxoplasma gondii are more common than in Europe. Many seroprevalence studies exist in the literature but the risk assessment of T. gondii infection after horse meat consumption is impossible because of the absence of validation of serological tests and the unknown correlation between detection of antibodies against T. gondii and presence of tissue cysts. We performed magnetic capture-polymerase chain reaction (MC-PCR) to detect T. gondii DNA in 231 horse meat samples purchased in supermarkets in France and evaluated the performance and level of agreement of the modified agglutination test (MAT) and Enzyme-linked immunosorbent assay (ELISA) in the meat juices. We also tested 196 horse sera from - institut français du cheval et de l'équitation, Chamberet, France - to assess the accuracy of ELISA, MAT and immunofluorescence antibody test (IFAT). The serological tests lacked sensitivity, specificity, agreement between them, and there was no correlation with the presence of T. gondii DNA in horse meat, raising concerns about the reliability of T. gondii seroprevalence data in horses from the literature. T. gondii DNA was detected in 43% of horse meat samples but the absence of strain isolation in mice from more than 100 horse meat samples suggest a low distribution of cysts in skeletal muscles and a low risk of T. gondii infection associated with horse meat consumption. However, to avoid any risk of toxoplasmosis, a thorough cooking of horse meat is recommended
Khoury, Graziella. "Tests immunologiques miniaturisés pour le développement de puces à peptides et à protéines." Ecully, Ecole centrale de Lyon, 2008. http://www.theses.fr/2008ECDL0001.
Full textPeptide and protein microarrays technology has shown great advancements in the field of biomedical research and diagnosis. It allows parallel analysis of multiple biomolecular interactions between probes (e. G. Antigen: peptide, protein) and their targets, present in a complexe biological sample, such as serum. This work consists to explore new methods for peptide and protein microarrays implementation, using fluorescent detection. Different surface chemistries have been developed to functionalize glass slides for the immobilization of peptide or proteins. Miniaturized immunoassays have been realized on microarrays for the detection of anti-histones antibodies in the sera of patients with auto-immune disease, the systemic lupus erythematosus (SLE). Analytical performances of these tests were compared with those of classical immunoassays, such as ELISA and Western blot. The aim of peptide microarrays development is to elaborate peptide libraries on solid support by in situ peptide synthesis. One of the key points of in situ synthesis is the final deprotection of the peptide on the support. This step was first optimized using a presynthesized side chain protected peptide, a fragment of histone H3 protein, presynthesized on resin. The peptide was immobilized onto amino functionalized glass surface by activation of its C-terminus (ex situ immobilization). The deprotection was carried out by using concentrated trifluoroacetic acid solution (TFA). This protocol allowed to conserve the stability of functionalized surfaces, and the biological interaction of the deprotected peptide with anti-histone H3 antibody. These results correlated with those obtained in classical ELISA between the specific antibody and the presynthesized protected peptide, versus non protected peptide. The same peptide epitope was then synthesized in situ on Si/SiO2 aminated support. The surface showed good stability after different synthesis cycles and acid deprotection on the substrate. However, the biological activity of the peptide synthesized in situ should be further studied, and the peptide should be cleaved and characterized with analytical tools, such as mass spectrometry. We also evaluated the performances of our protein microarrays for the detection of anti-histone antibodies in human serum of patients with SLE. We tested two surface chemistries for the immobilization of histone proteins: NHS ester surface and aminated surface modified with Maleic Anhydride-alt-Methyl Vinyl Ether (MAMVE) copolymer. The performances of our miniaturized immunoassays were compared to those of classical ELISA and Western blot. Results indicated that low detection limit obtained on MAMVE surfaces with commercial anti-histone antibody was 50 fold better than that of classical ELISA. Furthermore, 100 times less volume of biological materials are required. Our miniaturized immunoassays were more sensitive than ELISA and Western blot for the detection of anti-histone antibodies in human serum
Nogueira, Maria Leonor. "Les auto-anticorps anti-filaggrine spécifiques de la polyarthrite rhumatoîde : production et concentration dans le tissu synovial, identification d'antigènes-cibles dans le tissu synovial, développement et validation de tests diagnostiques." Toulouse 3, 2002. http://www.theses.fr/2002TOU30027.
Full textChampy-Tixier, Anne-Sophie. "Extraction, purification, and structurala nalysis of glycosylated natural products, mimetics of native antigens involved in an immune response." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCE003/document.
Full textThis PhD in co-direction between the Peptlab Laboratory of the University of Firenze (Italy) and the Laboratory of Pharmacognosy of the University of Bourgogne Franche-Comté (France), deals with extraction, purification and structural elucidation of saponins from plants as mimetic antigens involved in an immune response. The phytochemical study of five species from three different families, Wisteria frustecens, Wisteria floribunda “macrobotrys” and Wisteria floribunda “rosea” from Fabaceae, Weigela florida “rumba” from Caprifoliaceae, and Polygala acicularis from Polygalaceae, allowed us to isolate sixteen natural glycosides: six with new structures, one analyzed for the first time in its native form, and nine which have been already described in the literature. These compounds were isolated using various chromatographic methods, and their structures were elucidated using mainly 2D NMR and mass spectrometry. From the isolated glycosides, six were selected and tested as mimetics of native antigens involved in the immune response. Moreover, one flavonoid glycoside extracted from Sophora japonica, and one commercial triterpenic acid, ursolic acid, were also chosen as mimetics of native antigens. Immunoenzymatic assays (ELISA) were performed for each compound to evaluate their potential as mimetics of native antigens of multiple sclerosis and Rett syndrome. The IgM levels in sera of patients affected by multiple sclerosis and Rett syndrome were measured and compared to normal blood donors. Concerning multiple sclerosis, no significant results were obtained for saponins, but in the case of Rett syndrome, interesting and surprising results were obtained. Indeed, the first hypothesis was that the glycosyl part of the molecule could be relevant for antibody recognition. In the case of Rett syndrome ursolic acid, an aglycone without any glycosidic part, demonstrated a good efficiency in IgM recognition. On the other hand, one triterpenic glycoside showed similar results. These results were discussed to define possible structure/activity relationships
Knappik, Michael [Verfasser], and Thomas [Akademischer Betreuer] Löscher. "Aufbau und Evaluation eines NANP19-Circumsporozoitenprotein-Antikörper ELISA Tests zum Nachweis von Plasmodium falciparum Infektionen bei nichtimmunen Reisenden / Michael Knappik. Betreuer: Thomas Löscher." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1036143708/34.
Full textBarbosa, Luís Miguel Marques. "Production and characterization of the fusion ZZapo-CBM64 for the capture and detection of apolipoprotein-A1 in paper tests." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22709.
Full textAffibodies (ZZ) são pequenas proteínas de afinidade que podem ser modificadas para se ligarem a alvos específicos. Estas proteínas têm sido sugeridas como uma alternativa a anticorpos, devido ao seu processo de produção mais simples e barato. Assim, o objetivo deste trabalho de mestrado visou a possibilidade da utilização de um affibody (ZZapo) para a captura da Apolipoproteina-A1 (Apo-A1) e sua deteção com anticorpos Anti-Apo-A1 conjugados com Nanopartículas de Ouro (AuNPs) num Dispositivo Microfluídico Analítico de Papel (μPAD). Para atingir o objetivo proposto, a fusão de uma molécula com afinidade a carboidratos da família 64 (CBM64) com o affibody ZZapo (ZZapo-CBM64) foi desenhada, produzida em E.coli, sequenciada, purificada e quantificada com sucesso. A fusão ZZapo-CBM64 foi comparada com a fusão semelhante ZZ-CBM64, que tem afinidade para imunoglobulina G (IgG). Foi testada a capacidade de ligação das fusões à celulose, tendo-se verificado que ambas apresentaram alta afinidade a micropartículas e papel de celulose. Foi ainda testada a capacidade de ligação das duas fusões a IgG, pela utilização de IgG marcado com fluorescência. No entanto, ao contrário da ZZ-CBM64, a ZZapo-CBM64 não mostrou afinidade para a IgG. Um teste μPAD foi criado com barreiras impressas a cera hidrofóbica, e com um adesivo na base do teste, o que permitiu os testes serem feitos em superfícies planas e ainda contribuiu para um fluxo da amostra mais rápido. Os testes μPAD mostraram interações não específicas entre ZZapo-CBM64 e AuNPs, que foram removidas pela conjugação das AuNPs com Albumina de Soro Bovino (BSA) e adição de BSA e Tween20 à solução tampão. Os testes μPAD para deteção da Apo-A1 mostraram interações não específicas entre Apo-A1 e a membrana adesiva, que foram removidas pela utilização de um tampão de Bicarbonato de Amónia com BSA e Tween20. A deteção de Apo-A1 em μPADs não foi conseguida devido ao ZZapo-CBM64 não capturar a Apo-A1. Esta falha poderá ser devido a algum bloqueio da zona de captura relacionado com a estrutura 3D da fusão. De modo a ultrapassar esta questão, deverão ser realizados trabalhos futuros para o estudo da estrutura 3D da fusão, assim como estudo de outras fusões com diferentes variantes de affibodies para averiguar se o problema é exclusivo à fusão ZZapo-CBM64 ou não.
Affibodies (ZZ) are small affinity proteins that can be engineered to bind to specific targets. These molecules have emerged as an alternative to antibodies due to their simpler and cheaper production process. The objective of this work was thus to assess the possibility of using an affibody (ZZapo) to capture Apolipoprotein-A1 (Apo-A1) and its detection using Anti-Apo-A1 antibodies conjugated to Gold Nanoparticles (AuNPs) on a Microfluidic Paper-Based Analytical Device (μPAD). To achieve the proposed objective, a fusion of a Carbohydrate Binding Molecule of the family 64 (CBM64) with a ZZapo affibody (ZZapo-CBM64) was successfully designed, produced in E. coli, sequenced, purified and quantified. The ZZapo-CBM64 fusion was then compared to a similar ZZ-CBM64 fusion (produced and purified in the same way) with immunoglobulin G (IgG) binding capacity, and tested for its cellulose binding capacity. Both fusions showed high affinity to cellulose particles and paper. They were also tested for IgG binding capacity, using a fluorescently labelled IgG. While ZZ-CBM64 successfully captured IgG, the new ZZapo-CBM64 did not capture the labelled IgG. A μPAD test was designed and produced with wax printed hydrophobic barriers, and the use of an adhesive membrane in the bottom of the test enabled running tests on a flat surface, and contributed for faster sample flow. μPAD tests showed that ZZapo-CBM64 and AuNPs had non-specific interactions, which were removed by conjugating AuNPs with Bovine Serum Albumin (BSA) and using a buffer containing BSA and Tween20. μPAD tests for the detection of Apo-A1 showed non-specific binding of Apo-A1 and the adhesive membrane, which was removed by using ammonium bicarbonate buffer. Apo-A1 detection in μPADs was unsuccessful, which was shown to be caused by ZZapo-CBM64 failing to capture Apo-A1. This failed capture could be caused by the capture zone of the protein being blocked. Future works should be directed to the study of the 3D structure of this fusion, as well as the study of other fusions with different affibody variants to assess if this problem is exclusive to ZZapo-CBM64 or not.
Rousseau, Florence. "Mise au point d'un test de sérodiagnostic d'infections à Chlamydia Pneumoniae : intérêt des peptides de synthèse dans une méthode immunoenzymatique." Amiens, 1999. http://www.theses.fr/1999AMIED006.
Full textDubois, Christelle. "Confirmation de biomarqueurs pour le pronostic du sepsis et développement de tests rapides High plasma level of S100A8/S100A9 and S100A12 at admission indicates a higher risk of death in septic shock patients Top-down and bottom-up proteomics of circulating S100A8/S100A9 complexes in plasma of septic shock patients." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS521.
Full textSepsis is the 3rd leading cause of death in Western countries, with a mortality rate between 20 and 50% depending on the severity. The 'prediction' of the patient's clinical outcome is essential to establish the most appropriate treatment. Some inflammation or infection markers protein (CRP, procalcitonin) are cited for clinical follow-up of patients but lack specificity for sepsis. On the other hand, "omics" studies have generated lists of potential biomarkers of sepsis prognosis. However, none have yet been validated and/or confirmed based on the severity of the sepsis and the patient's fate. This requires access not only to fully characterized patient cohorts but also to robust and validated quantitative methods. Mass spectrometry provides a high level of specificity and high multiplex capacity and that would allow to confirm the interest of one or more of these proteins for sepsis prognosis. Immunological assays provide, in addition to sensitivity and specificity, a simple and rapid routine clinical implementation. First, a list of biomarkers identified with patient cohorts was established from the literature. Then, methods to quantify these candidate biomarkers were developed. On the one hand, we have been interested in quantifying calgranulins in plasma by developing ELISAs and mass spectrometry methods using bottom-up and top-down approaches. On the other hand, two multiplex quantification methods by mass spectrometry with and without immunopurification step according to protein concentrations have been developed to verify the relevance of the list of potential biomarkers. All these methods were applied to a cohort of 49 patients with septic shock
Kikkas, Ingrid. "Development of immunoassays for diagnosis of type 1 diabetes." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA114824.
Full textType 1 diabetes is an autoimmune disease characterized by the destruction of pancreatic beta cells within the islets of Langerhans. In the course of this autoimmune process, autoantibodies are generated against several beta-cell antigens, e.g. insulin, glutamic acid decarboxylase (GAD65), tyrosine phosphatase-like protein (IA-2) and zinc transporter 8 (ZnT8). At least one autoantibody against one of these antigens is present in >95% of individuals with type 1 diabetes upon hyperglycemia detection. These autoantibodies can serve as early markers of type 1 diabetes, since they can be present years before disease onset, allowing for an early diagnosis before clinical manifestations. In the course of this thesis we have developed, in partnership with a clinical research team, a series of original diagnostic tests, based on the early detection of the different anti-Langerhans islet autoantibodies from human serum samples. These diagnostic tests include bridging ELISAs for the detection of autoantibodies to insulin, IA-2 and GAD65, which are rapid, non-radioactive and easy-to-use. Moreover, a lateral flow immunoassay (dipstick) for detection of autoantibodies to IA-2 was developed. The key advantage of lateral flow immunoassay is its user-friendly format: results can be obtained within 45 min using very small volumes of sera and without the use of any specialized apparatus. All these in-house assays were validated with diabetic and healthy human serum samples and the assay performances were compared to commercially available tests on the market. In addition, we have developed a multiplex assay for simultaneous detection of multiple diabetes-associated autoantibodies, which is time-effective and increases the diagnostic and predictive values of the assay, comparing to single autoantibody detection. This multiplex assay was validated for detection of two autoantibodies i.e. IA-2A and GADA and compared to in-house IA-2A and GADA bridging ELISAs
Kalach, Nicolas. "Mise au point et validation des méthodes non invasives biologiques impliquées dans le diagnostic des infections gastriques à Helicobacter Pylori chez l'enfant." Amiens, 1997. http://www.theses.fr/1997AMIED001.
Full textThe purpose of our study was to access the validity of the serodiagnosis ELISA type IgG and the urea breath test 13C(13C-UBT), in non invasive diagnosis and follow up of Helicobacter pylori infection (H pylori) in children. The results of a serological test (Cobas Core Roche, IgG, 2nd Generation) were compared with those of endoscopical gastric biopsies analysed by bacteriological culture and histology (reference method). This test seems to be sensitive and benefic, but a negative result does not exclude the diagnosis, especially in children under 10 years. On the other hand, this test exhibited a very poor sensitivity in the follow up of infection. Thus, endoscopical gastric biopsies for culture and histology remains the reference methode for the determination of acute H pylori infection in children. H pylori was searched for in children by bacteriological counts and culture on antral biopsies and by 13C-UBT. 13C-UBT is sensitive and specific in children ; it is correlated with biopsy bacteriological counts, suggesting the use of this test in the follow up of infection. The use of a two samples collected at T0 and T40 is also sensitive and specific and T40 seems to be the best discriminating time. The use of a single sample collected at T40 appears sufficient to define the H pylori status in children
Martin, Jacques. "Apport de nouvelles technologies aux tests de diagnostic sérologique : de la molécule native à la molécule synthétique : validation par le modèle Chlamydia et le modèle rétroviral HIV." Tours, 1990. http://www.theses.fr/1990TOUR3805.
Full textBerger, Eric. "Les anticorps anti-mannanes dans le sérodiagnostic de candidose : intérêt et limites." Bordeaux 2, 1995. http://www.theses.fr/1995BOR2P104.
Full textPiano, Luciana Pereira de Almeida de. "Valor do teste de dosagem do Dímero - D plasmático no diagnóstico do tromboembolismo venoso agudo." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-13022008-100326/.
Full textIntroduction: The thromboembolic disease is a multicausal complex disturb with signals and symptoms that confusing itself with other diseases. Because its gravity strategies search objecting to get a faster diagnosis. The measure plasmatic D dimer test seems to be an alternative for exclusion of the diagnostic of acute venous thromboembolism. Objectives: To evaluate the value of the measure plasmatic D dimer test, using the method Enzyme Linked Fluorescent Assay (ELFA), in the diagnostic of acute venous thromboembolism. Methods: In 89 patients with signals and symptoms suggestive of pulmonary thromboembolism and/or deep vein thrombosis had been carried through measure D dimer by technique ELFA equipment VIDAS® - BioMérieux. The values of sensibility, accuracy specificity, predictive values positive and negative and of the test had been calculated, as well as curve ROC of the sample studied. All the patients had been submitted the image exams for the confirmation of the acute thromboembolism event. It was calculated kappa ratio to compare D dimer test results with image exams results. Results: Between 89 studied patients (mean of age 54.3 years; 51 women), 36 (40.4%) they had presented and 53 had not presented acute thrombosis (59.6%). It enters the patients without acute thromboembolism 15 (28.3%) had presented resulted negative of D dimer. All patients with thrombosis had presented resulted positive of D dimer. The test presented 100% sensibility; 28.3% of specificity; positive predictive value was 48.6%; 100% of negative predictive value and accuracy value was 57.3%. The area under the curve (AUC) to total sample studied was 0.734, it was showed that the test have a good prediction to acute thrombosis. The kappa ratio value was 0.24 (p<0.001) showing a bad concordat n to thrombosis diagnostic. Conclusion: The measure of D dimer by method ELFA was able to exclude the diagnostic of acute venous thromboembolism in this sample studied. The results obtained in this sample studied let to conclude that the D dimer test in patients with suspected of acute thromboembolism presented high sensibility to diagnostic of this disease.
Garin-Bastuji, Bruno. "Le lipopolyoside S des Brucella en phase lisse : approche immunochimique : intérêt dans le diagnostic des brucelloses." Tours, 1993. http://www.theses.fr/1993TOUR3805.
Full textOliveira, Flávia Carolina Souza de. "Padronização do teste imunoalérgico e de reação imunoenzimática aplicados ao diagnóstico da tuberculose e micobacterioses em suínos (Sus scrofa) experimentalmente sensibilizados com suspensões oleosas de M. bovis ou M. avium inativados." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/10/10134/tde-15102012-091548/.
Full textThe diagnostic value of the cutaneous allergic response to tuberculin and Indirect ELISA test was investigated using MPB 70 recombinant antigen, in piglets experimentally sensitized intramuscularly with the oily suspensions of inactivated M. bovis or M. avium. The ninety-one animals used were divided into four groups. The groups A and B were formed each with 25 individuals, and groups C and D, with 21 and 20 individuals, respectively, balancing the characteristics of race, ancestry, age and sex. At the age of 21 days, all the animals were submitted to the screening test with the use of M. bovis PPD, by the intradermal route at the base of the ear and no reaction was detected. Sixty days after the screening tuberculin test, animals of the group A were injected intramuscularly with 0.5 mL of oily suspension of M. avium D4 strain; animals of group B received 0.5 mL of an oily suspension of M. bovis, AN5 strain; and the members of group C (control I) received 0.5 mL of an oily adjuvant and the individuals of group D (control II) received 0.5 mL of saline solution. Histological examinations of biopsies of skin reactions were carried out and blood collections made for capture ELISA. Following 30 days of sensitization, comparative skin reactions were measured by the variation in skin thickness with a caliper at 0h, 24h, 48h an 72h after applications of tuberculins. In the comparative test measured at 72h, the reaction was considered negative when the difference of the reactions between bovine PPD and avian PPD was less than 6.7 mm; suspected or inconclusive, when the difference stood in the range of 6.7 to 7.5 mm; and positive according to the type of PPD, considering tuberculosis the M. bovis PPD and mycobacteriosis the M. avium PPD, when the difference of the reaction was greater than 7.5 mm. In histopathological examinations, intense lymphocytic inflammatory infiltrate were observed at the site of intradermal reactions of the animals tested with PPD homologous to the type of mycobacteria used in sensitizing oil suspension. The ELISA assay with MPB 70 recombinant antigen was able to reveal the presence of antibodies against M. bovis, but did not reveal antibodies to M. avium.
Haller, Logan C. "Development of a micropshere-based immunoassay for the detection of IgM antibodies to West Nile virus and St. Louis Encephalitis virus in sentinel chicken sera." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001505.
Full textBoufaied, Nadia. "Mise au point d'un test ELISA pour détecter les anticorps anti-Chlamydia pneumoniae." Sherbrooke : Université de Sherbrooke, 2000.
Find full textSilva, Gabriela Pagano de Oliveira Gonçalves da. "Estudo comparativo entre teste rápido imunológico (LID-NDO) e PCR tempo real de raspado dérmico em álcool e em papel-filtro na hanseníase." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/17/17138/tde-17042018-135821/.
Full textLeprosy is an infectious disease that affects skin and peripheral nerves. Leprosy diagnosis is mainly based on its variable clinical aspects and few complementary tests that aid in the diagnosis, such as bacilloscopy, histopathology, besides the antiPGL1 ELISA (APGL1) and anti-LID, all of which are generally positive in multibacillary forms, confirming the difficulty in diagnosis of paucibacillary patients. The aim of this study was to compare the results obtained with the Orange Life® Immunological Rapid Test (LID-NDO) with the real-time PCR results obtained in the intradermal scraping samples and the results of the ELISA APGL1, collected during the \"Hanseníase\" action in Brasília in January 2014, in addition to comparing efficiency between two different methods of preservation of these samples (filter paper x alcohol). A total of 277 dermal smear samples were collected from 50 patients clinically diagnosed with leprosy during the procedure. At the same time, the individuals diagnosed were submitted to peripheral blood collection for serological rapid test (Orange Life®) and ELISA APGL1. The extraction of DNA from intradermal scrapings, stored in alcohol and filter paper, was carried out at the Dermatology Laboratory of HC-FMRP-USP. Real-time PCR was performed using a pair of primers specific for the RLEP gene, and the master sybr green-Promega. From 50 patients diagnosed clinically, 90% are multibacillary. All tests, both the serological rapid test and the PCR, were more positive in multibacillary patients. The rapid serological test was positive in 64.44% of the multibacillary patients, and in 40% of the paucibacillary. The PCR in the samples stored in the alcohol was positive in 19.05% of the multibacillary patients and the PCR of the filter paper in 17.78%; PCR weren\'t positive in paucibacillary patients. ELISA APGL was positive in 56% (28) of the diagnosed patients. In the PCR of the samples stored in the filter paper, the collection site with the highest positivity was the elbows (75%). The agreement between the rapid serological test and the PCR and the agreement between the rapid test and the ELISA APGL1 were fair. The agreement between the PCR of the samples stored in the alcohol and the PCR of the samples stored on the filter paper was perfect. We conclude that the clinical examination is still essential for the diagnosis of leprosy, especially in paucibacillary forms. We also concluded that the methods of storing the material collected by intradermal scraping (filter paper x alcohol) do not interfere in the final result of the PCR, therefore the storage in the filter paper can be done preferentially because it presents a lower cost for the extraction of DNA. Rapid serological test and the anti-PGL1 ELISA have low specificity, but may have other different applications than the diagnosis of leprosy.
Araujo, Rafael Ferreira [UNESP]. "Resposta sorológica de bovinos vacinados contra o Clostridium chauvoei avaliada pelos testes de aglutinação em placa e Elisa." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/94647.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O carbúnculo sintomático é um problema sanitário mundial, responsável por elevados coeficientes de mortalidade em bovinos e ovinos. A imunização dos animais jovens, seguida de reforço anual até 2,5 anos de idade, é a principal medida profilática. Foram realizados três experimentos distintos com intuito de avaliar as respostas sorológicas de bovinos vacinados contra o carbúnculo sintomático, pelos testes de aglutinação em placa e Elisa, empregando-se como antígenos a cepa de referência (MT) e uma cepa de campo (SP). No primeiro experimento, os bezerros foram organizados em três grupos (G1, G2 e G3) e submetidos a três protocolos distintos de vacinação empregando-se uma vacina comercial polivalente contra clostridioses. O G1 foi primovacinado aos 4 meses de idade e recebeu o reforço na desmama (8 meses). O G2 recebeu a primeira dose na desmama e reforço 30 dias após. O G3 foi vacinado somente na desmama. As coletas de soro foram realizas aos 4, 8, 9 e 10 meses de idade dos bezerros. O G1 apresentou a melhor resposta sorológica em comparação aos outros dois protocolos. Quando a avaliação dos grupos foi realizada aos 10 meses de idade, independente do protocolo empregado, a resposta sorológica foi similar. No segundo experimento, foi avaliada a imunidade natural passiva de bezerros, filhos de vacas vacinadas até 30 dias antes do parto (2ª dose), empregando-se duas vacinas comercias polivalente contra clostridioses. As coletas de soro foram realizadas aos (±)7, 45 e 90 dias de idade dos bezerros. Independente das vacinas empregadas na imunização ativa das mães, a resposta sorológica passiva dos bezerros avaliados foi similar até os 3 meses de idade. Houve uma correlação linear da resposta sorológica passiva dos bezerros com a data de vacinação das mães e o dia do parto quando empregado o teste de Elisa. No terceiro experimento, as 30 vacas...
Black leg disease is one of the most important sanitary problem, responsible for high levels of mortality observed in bovines and ovines herds. The vaccination of young animals, followed by annual booter until 2,5 years-old, is the major preventive measure against outbreaks. Three distinct experiments were conducted to measure the vaccinal response from bovines. The vaccinal strains used were the reference MT and field Clostridium chauvoei isolated. Sera from vaccinated animals were tested by agglutination and Enzyme Linked Immunosorbent Assay (Elisa), both standardized for the present study. First experiment, calves were divided into three groups (G1, G2 and G3); and submitted to three vaccination schedule with a polyvalent vaccine. The G1 received first vaccine at 4 months of age and a subsequent booster after calving (8 month-old). The G2 received first vaccine dose after calving and booster at 30 days after. The G3 received only one vaccine dose at 8 months. The sera were colleted at 4, 8, 9 and 10 months for all groups studied. The G1 group showed the best serological response at 10 months of age in comparison to G2 e G3 and control. Moreover, at 10 months of age all groups presented similar levels of serological response. The second experiment, the natural immunity of calves, separated from their mothers vaccinated 30 days before calving with two polyvalent vaccines. The respective serum was colleted at (±) 7, 45 and 90 days of age. All calves presented similar serological response at 3 months of age, independent of vaccinal strain used. The third experiment, 30 heifers, Nelore race, aged above 4 years-old, without vaccination against black leg, were vaccinated with two Clostridium strains. When the SP strain was used the serological response was considered good in G3 (first experiment), second and third experiment for agglutination assay. To compare both techniques, agglutination... (Complete abstract click electronic access below)
Albeer, Merna. "Evaluation of ELISA and rapid test for the analysis of fecal Calprotectin." Thesis, Uppsala universitet, Institutionen för kvinnors och barns hälsa, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227234.
Full textVanat, Isabelle. "Evaluation d'un test ELISA pour le diagnostic de la métrite contagieuse équine /." Berne, 1991. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textToscano, Ilda Antonieta Salata [UNESP]. "Influência das substâncias húmicas aquáticas na determinação de atrazina por imunoensaio (Elisa)." Universidade Estadual Paulista (UNESP), 1999. http://hdl.handle.net/11449/105676.
Full textSubstâncias húmicas aquáticas (SHA) foram obtidas por processo de adsorção em resinas macroporosas não-iônicas, XAD 7 e XAD 2, dispostas em série. Após eluição com solução de NaOH, o extrato alcalino de SHA foi acidificado a pH 1,0 para separação em ácidos húmico (AH) que precipita, e ácido fúlvico (AF) o qual permanece em solução. Para caracterização físicoquímica do material húmico (AH e AF), foram feitas análise elementar, determinação do teor de substâncias húmicas e acidez total. Os resultados obtidos por UV-VIS e FTIR indicaram que AH apresenta maior número de grupos aromáticos em relação a AF, que em geral possui mais cadeias alifáticas. A aplicação da técnica imunoquímica, enzyme-linked immunosorbent assay (ELISA), para a determinação do herbicida atrazina em águas foi avaliada em amostra de água contendo alto teor de matéria orgânica (~35 mg L-1) e baixo valor de pH (3,8). O efeito matriz devido a presença de SHA pode ser notado pela perda de sensibilidade da técnica, ou seja, os valores de IC50 variaram de 60 ng L-1, na ausência de SHA, para 112 ng L-1 em concentrações acima de 10,0 mg L-1 de material húmico e para 137 ng L-1 em pH < 5,0. Além disto, pode-se inferir que a luz solar aumentou a velocidade de degradação da atrazina na presença de SHA formando produtos, com partes de suas estruturas, semelhantes ao produto original levando a resultados falso-positivos. A quantidade de material húmico presente na amostra de água foi a principal fonte de erro na análise de atrazina, levando à interações não-específicas entre as SHA e os reagentes enzimáticos. O procedimento ELISA, aplicado neste estudo, pode ser utilizado para determinação de atrazina desde que se faça diluição da amostra até cerca de 2,5 mg L-1 de húmicos e em pH alcalino (7,0 – 9,0).
Aquatic humic substances (AHS) were isolated from water samples using Amberlite XAD 7 and XAD 2. After elution with NaOH solution, the XAD concentrated AHS was fractioned at pH 1.0 resulting in fulvic acid (FA - supernatant) and humic acid (HA - slurry). All humic materials were characterized with respect to elemental analysis, amount of AHS and total acidity. UV and FTIR spectra showed HA aromatic character greater than FA. Enzyme-linked immunosorbent assay (ELISA) was evaluated by analyzing atrazine in rich-humic matter water sample (~35 mg L-1) and acid water (pH 3.8). From all the conditions studied the low pH (pH < 5.0) and high humic substances concentrations (>10 mg L-1) showed the greatest influence. The IC50 values to control sample (no humic) decreased from 60 ng L-1 to 112 ng L-1 to humic solution at >10 mg L-1 and to 137 ng L-1 at pH < 5.0. The presence of AHS alters the photochemical behaviour of atrazine by accelerating its degradation forming metabolites which can be recognized by the antibodies. The assay performance showed a strong dependence on the pH values and amount of humic matter. However, analysis could be carried out directly in samples containing HA or FA that had been adjusted the pH in the range between 7.0 and 9.0, and humic concentration at 2.5 mg L-1.
Cruz, Jaqueline Silva. "Avaliação de testes diagnósticos para a identificação da infecção pelo vírus da dengue em pacientes com síndrome febril aguda." reponame:Repositório Institucional da FIOCRUZ, 2014. https://www.arca.fiocruz.br/handle/icict/10291.
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Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
A dengue é atualmente um dos principais problemas de saúde pública do mundo e segundo a Organização Mundial de Saúde (OMS) é a doença que mais acomete o homem na atualidade. Sua incidência vem aumentando e estima-se que 50-100 milhões de pessoas desenvolvam a doença a cada ano no mundo. O diagnóstico laboratorial da dengue é realizado por diferentes tipos de testes, entre eles estão o isolamento viral, o RT-PCR, e a detecção por ELISA ou por meio de testes rápidos do antígeno viral NS1 e de anticorpos IgM específicos contra o vírus. A fim de contribuir para um melhor entendimento sobre a validade destes testes em diferentes circunstâncias, o objetivo principal deste trabalho foi avaliar a validade dos diferentes métodos laboratoriais no diagnóstico da dengue. A sensibilidade dos testes diagnósticos, ELISA IgM, ELISA NS1 e RT-PCR, foi avaliada de forma individual e de forma combinada utilizando amostras de soro de 623 pacientes incluídos em um estudo prospectivo de vigilância de base populacional entre fevereiro e julho de 2010. A sensibilidade destes testes também foi avaliada de acordo com a duração dos sintomas, com o tipo de infecção (primária vs secundária) e, por sorotipo infectante. A especificidade de cada método foi avaliada em um grupo de amostras de pacientes com diagnóstico laboratorial de leptospirose, hepatite, doadores de sangue e indivíduos sadios. Os resultados encontrados mostraram que 240 (38%) dos pacientes com doença febril aguda apresentaram dengue no período do estudo sendo que 194 (81%) dos pacientes com dengue representavam pacientes com infecções secundárias, o sorotipo predominante foi o DENV-2 (70%). As sensibilidades do RT-PCR, do ELISA NS1 e do ELISA IgM na amostra de fase aguda foram de 83,3%, 31,7% e 30%, respectivamente. O uso combinado do teste RT-PCR e do teste ELISA IgM em uma amostra de fase convalescente foi capaz de identificar 100% dos casos confirmados de dengue. As especificidades encontradas variaram de 97% a 100% para o ELISA NS1 e de 55% a 85% para o ELISA IgM. Os resultados indicam que na fase aguda da doença o RT-PCR é mais sensível a detecção de anticorpos IgM e do antígeno NS1 por ELISA, entretanto, o uso de métodos diagnósticos adicionais pode ser necessário em pacientes com uma suspeita da doença e resultado negativo do RT-PCR.
Dengue is currently one of the main problems of public health and the world according to the World Health Organization (WHO) is the disease that affects more men today. Its incidence is increasing and it is estimated 50-100 million people develop the disease each year worldwide. Laboratory diagnosis of dengue is done by testing different types, which include viral isolation, RT-PCR, and detection by ELISA or by rapid viral tests NS1 antigen and specific IgM antibodies against the virus. In order to contribute to a better understanding of the validity of these tests in different circumstances, the aim of this study was to evaluate the validity of different laboratory methods for diagnosis of dengue. The sensitivity of diagnostic tests, IgM ELISA, ELISA NS1 and RT-PCR was evaluated individually and in combination form using serum samples from 623 patients enrolled in a prospective population-based study of surveillance between February and July 2010. The sensitivity of these tests was also evaluated according to the duration of symptoms of infection with the type (primary versus secondary), and the infecting serotype. The specificity of each method was evaluated in a group of samples from patients with laboratory diagnosis of leptospirosis, hepatitis, blood donors and healthy individuals. The results showed that 240 (38%) of patients with acute febrile disease had dengue during the study period of which 194 (81%) of patients with dengue represented patients with secondary infections, the predominant serotype was DENV-2 (70% ). The sensitivity of the RT-PCR of NS1 and IgM ELISA ELISA in the acute phase of the sample were 83.3%, 31.7% and 30%, respectively. The combined use of RT-PCR and ELISA IgM in a sample convalescent phase was able to identify 100% of confirmed cases of dengue fever. The specificities found varied from 97% to 100% for ELISA NS1 and 55% to 85% for the IgM ELISA. The results indicate that the acute phase of the disease the RT-PCR is more sensitive detection of IgM antibodies and NS1 antigen by ELISA, however, the use of additional diagnostic methods may be necessary in patients with a suspicion of disease and negative outcome of RT-PCR.
Souza, Laís Cristina de. "Reconhecimento da ligação dos anticorpos anti-HCV com proteínas recombinantes do vírus da hepatite C por meio do teste ELISA." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8396.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Viral hepatitis is a major public health problem worldwide and in Brazil. They are notifiable diseases and according to estimates, billions of people have had contact with the hepatitis and millions are chronic carriers. Infection with hepatitis C virus (VHC) is a major problem worldwide public health due to the high rate of progression to chronicity, the evolutionary potential for cirrhosis and hepatocellular carcinoma, major complications leading to death. In general it can be said that in the last decade there have been major advances in the diagnosis of hepatitis C. In this period there was progressive improvement in sensitivity and specificity of the tests used to detect antibodies against the VHC virus. However, it is necessary that more accurate tests are developed. Thus, considering that the concern for the detection of hepatitis C increases every day, especially in blood banks; the diagnostic methods of this infection are of great clinical relevance and may be used as markers chronicity and indicative of therapeutic efficacy. Therefore, this work proposed to evaluate the connection and recognition of anti-VHC antibody positive and positive genotyped samples in patients with hepatitis C through the standardization of procedures and solutions used in qualitative ELISA. There was the process of awareness of microplates with recombinant chimeric protein, made the analysis of sensitivity, specificity, reproducibility and validity of the method. We obtained from ELISA assays with standardized recombinant proteins a protocol able to have a good performance of the main components of the reaction, and antigens conjugated with good resolution. This study presented ELISA results valid 95.69%, 100% reproducibility, 94.5% sensitivity and specificity 99.3%, higher than the ELISA performed with multiepitopo protein MEHCV who presented with sensitivity (92.86%) and specificity (82.89%). The standard ELISA can be used as a qualitative serological technique aimed at detection of anti-VHC antibodies, as demonstrated with great reactivity in patients infected with VHC.
As hepatites virais são um grave problema de saúde pública no mundo e no Brasil. São doenças de notificação compulsória e segundo estimativas, bilhões de pessoas já tiveram contato com vírus das hepatites e milhões são portadores crônicos. A infecção pelo vírus da hepatite C (HCV) constitui um grave problema de saúde pública mundial devido à elevada taxa de progressão para cronicidade, ao potencial evolutivo para cirrose e carcinoma hepatocelular, principais complicações conducentes à morte. Em geral, pode-se dizer que na última década houve grandes avanços no diagnóstico da hepatite C. Nesse período houve progressiva melhora na sensibilidade e especificidade dos testes utilizados para detecção de anticorpos contra o vírus HCV. Contudo, é necessário que sejam desenvolvidos testes de maior acurácia. Assim, considerando que a preocupação com a detecção da hepatite C aumenta a cada dia, principalmente em bancos de sangue; os métodos diagnósticos desta infecção são de grande relevância clínica e podem ser utilizados como marcadores de cronicidade e indicativos da eficácia terapêutica. Portanto, esse trabalho propôs avaliar a ligação e reconhecimento dos anticorpos anti-HCV de amostras positivas e positivas genotipadas de pacientes portadores de Hepatite C, através da padronização dos procedimentos e soluções utilizadas no ELISA qualitativo. Realizou-se o processo de sensibilização das microplacas com proteína recombinante quimérica, fez-se a análise da sensibilidade, especificidade, reprodutibilidade e validade do método. Obtivemos a partir dos ensaios de padronização do ELISA com proteínas recombinantes um protocolo capaz de ter um bom rendimento dos principais componentes da reação, antígenos e conjugado, com boa resolução. O presente estudo apresentou-se resultados do ELISA com validade 95,69% , reprodutibilidade 100%, sensibilidade 94,5% e especificidade 99,3%, superior ao ELISA realizado com a proteína multiepitopo MEHCV que apresentaram com sensibilidade (92,86%) e especificidade (82,89%). O ELISA padronizado pode ser utilizado como uma técnica sorológica qualitativa, visando a detecção de anticorpos anti-HCV, pois mostrou-se com ótima reatividade nos soros pacientes infectados com HCV.
Lago, Eloi Marcos de Oliveira. "Avaliação do desempenho diagnóstico do teste ELISA para a cisticercose em inquéritos sorológicos." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/9/9136/tde-10122007-141320/.
Full textThe serum diagnosis of cyticercosis has been highlighted as an efficient alternative source in the study of the disease. With an accessability proposal , due to the expense, the ELISA´s tests are promising to the serum´s field research. This problem makes necessary the use of antigens extracts able to give the test, trusted and compatible parameters to the research of antibodies in the population of low prevalence. In this context, this current work stablished the evaluation of the ELISA´s test with a high predictive value positive(PPV) to the anti-cysticerci of Taenia solium antibodies research in a serum inquiry of the general population. The antigens tested were the 18/14 kDa protein of the vesicular liquid of T. crassiceps (18/14-Tcra), the vesicular liquid of T. crassiceps (LV-Tcra) and the total of T.solium (T-Tso). That constituted in the ELISA 18/14, ELISATcra and ELISA-Tso test respectively. There were 610 sample of serum were tested of healthy people and 20 samples of serum with confirmed neurocysticercosis by clinical and laboratorial criterias. After these tests, the ELISA´s test showed sensibility and specificity in 100% of the cases, even in different prevalences (0,1; 0,5; 1,0 and 5,0%) the VPP and the predictive value negative (VPN) were also fixed in 100%. The repetition of the test expressed in variation coefficient occurred between 16 and 18% of the cases. The ELISATcra didn´t show the same development, the specificity were calculation in 96,3% and the VPP wanted between 2,6 and 59,3% to the prevalences of 0,1 to 5,0%; there were similarities of the results of sensibility and VPP. The ELISA-Tso showed less important results the specificity was calculated in 95,7% and the VPP between 2,3 and 55,0% to the prevalences of 0,1 to 5,0%, this reduction of specificity is due to the increase of the number of false-positive results in the test because of the expression of proteins of high molecular weight. Through these parameters it´s clear the promising development of the ELISA-18/14 test, as been arbitrary in the studies of serology inquiry in the general population.
Boufaied, Nadia. "Mise au point d'un test ELISA pour détecter les anticorps anti-Chlamydia pneumoniae." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0015/MQ61718.pdf.
Full textMansuy, Jean-Michel. "Application de L'Elisa utilisant les exo-antigènes de Strongyloïdes ratti au diagnostic immunologique de la strongiloïdose." Toulouse 3, 1992. http://www.theses.fr/1992TOU31707.
Full textSAGNE, CALLOIX MARIE-CHRISTINE. "Hydatidose de l'enfant et de l'adulte : mise a jour bibliographique ; evaluation d'un kit e.l.i.s.a. ; a propos du suivi de 31 malades." Toulouse 3, 1992. http://www.theses.fr/1992TOU31706.
Full textMille, Mireille. "Application de la methode elisa au suivi sero-immunologique d'une population canine vaccinee contre la leishmaniose." Aix-Marseille 2, 1989. http://www.theses.fr/1989AIX20905.
Full textDornas, Fábio Pio. "Investigação sorológica de anticorpos IgM e IgG anti-dengue em crianças atendidas no Centro de Saúde Escola Dr. Edgard Aché do município de Ribeirão Preto,São Paulo." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/60/60135/tde-29062012-152741/.
Full textDengue is an infectious viral disease transmitted by the biting of mosquitoes of Aedes genus and it is an important public health problem worldwide. Infection with any of the four serotypes (DENV 1-4) may be asymptomatic or causes illness ranging from mild viral syndrome, dengue fever (DF) to dengue hemorrhagic fever (DHF). An increasing number of dengue infection cases in children have been noted in the last years. A dengue surveillance study might be an important tool in endemic region to evaluate the incidence of dengue infection in children. Thus, the aim of this study was to investigate the prevalence of anti-dengue IgM and IgG antibodies in children in the Primary Health Care Center, Dr. Edgard Aché, located in the west region of Ribeirão Preto-SP. Children (n=271) from 1 to 15 years old were recruited during March 2010 until May 2011. After a signed consent by the person responsible for the children to participate in this study, a blood sample was collected. The children were classified in asymptomatic (n=174) or symptomatic (n=97) when they had more than one symptom suggestive of dengue according to the World Health Organization criterions. Anti-dengue IgM and IgG were detected in serum samples by a capture ELISA standardized in our laboratory. IgG capture ELISA was positive in 9,23% (25/271) and IgM capture ELISA in 8,49% (23/271) of the children. IgG capture ELISA was positive in 10,31% (10/97) of the symptomatic children and 8,62% (15/174) in asymptomatic children; while IgM capture ELISA was positive in 15,46% (15/97) of symptomatic children and 4,6% (8/174) in asymptomatic children. This study showed the high prevalence of anti-dengue antibodies in children in the west region of Ribeirão Preto. In addition, a high prevalence of dengue-infected children without symptoms was observed. The present survey demonstrated that dengue virus infection might be a problem in children\'s from Ribeirão Preto city and serve as an alert to the health authorities.
Cavalheiro, Norma de Paula. "Análise dos Sorotipos do VHC Identificados em Pacientes da Cidade de São Paulo, Através de Método Imunoenzimático." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/5/5160/tde-08032005-144648/.
Full textCAVALHEIRO, N.P. Analysis of serotypes of HCV in patients from the city of São Paulo, by means of a enzyme-immunoassay method. São Paulo, 1999. 97p. Dissertação de Mestrado - Faculdade de Medicina, Universidade de São Paulo. With the objetive of analysing the prevalence of the different types of Hepatitis C Virus (HCV) in a population of chronic carriers of HCV, through a sorologic method (MUREX HCV Serotyping Assay), 219 patients were studied who showed a positive polymerase chain reaction. This sera were submitted to immunoenzimatic tests for the detection of antibodies in relation to HCV types 1, 2,3,4,5 and 6. The samples were diluted and incubated in the presence of heterologous competing peptides, with microwells coated with serotype-specific antigens of HCV. Of the 219 patients, it was possible to detect the HCV serotype in 166, revealing a sensitivity of 75.8%. The results showed a predominance of type 1 (70.0%) in our medium, followed by type 3 (22.3%) and type 2 (4.2%). Serotypes 4 and 5 were present in 1.8% of the patients, but always associated with serotype 1. These samples, in spite of fulfilling the prerequisites of validity for testing, showed a very high optical density reading for all types of viruses tested, including positive and negative controls. The possibility of cross reactions in these cases should be considered. Confirmation by genotyping and a more detailed investigation on the origin and mode of acquisition of the HCV of these patients should be researched. Type 6 was not confirmed in any of the samples tested and probably was not present in this particular collection. The epidemiological parameters evaluated were: age, sex and means of transmission. Of the 166 patients diagnosed with the HCV, 108 (65.1%) were men and 58 (34.9%) were women. The age of the patients varied from 12 to 73 years, the average being 41.1 years. The means of transmission mentioned were blood transfusion in 52 (31.3%) cases, intravenous drug use in 18 (10.8%) cases, by tatoos in 8 (4.8%) cases, 6 (3.6%) cases were sexually transmitted, 3 (1.8%) were by accident with a needle, 2 (1.2%) through work in the health field, one (0.6%) through acupunture and one by being hemophiliac. Sixty one (36.7%) patients were not able to offer any risk factor which justified the acquisition of the HCV infection. No significant difference was verified among the different types of HCV found and the different epidemiological parameters studied. The predominance of types 1, 3 and 2 is compatible with other genotyping studies which involved Brazilian samples, particularly in the city of São Paulo. The samples which showed high or low dense optical reading for all the wells of the same samples tested even the positive or negative controls, suggested confirmation by sequecing or genotyping. The praticality obtained by the HCV serotyping test, in spite of the fact that it does not identify the sub type, can be useful in clinical pratice and helpful in the prognostication of the disease, not needing the tecnology demanded by the tests which involve molecular biology.
Silva, Jaqueline Raymondi. "Pesquisa de infecções por Flavivírus da encefalite de Saint Louis, Rocio e Oeste do Nilo em cavalos, por inquérito sorológico e isolamento viral." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/17/17147/tde-23062010-150025/.
Full textArboviruses are a serious public health problem in Brazil and, from these, the most important are caused by Flavivirus. Eleven Flavivirus have been described in Brazil. Of these, Saint Louis Encephalitis Virus (SLEV) and Rocio Virus (ROCV) are major public health problems and belongs to the Japanese Encephalitis Serocomplex. West Nile Virus (WNV), introduced in the American continent in 1999, has not yet been detected in Brazil. In this study, it was evaluated the circulation of SLEV, WNV and ROCV in horses, by viral isolation attempts and a serosurvey. Viral isolation attempts were performed in 11 brain tissues of horses from Paraíba state with negative results. It was used for the serosurvey, an IgG-ELISA with recombinant peptides of domain III of SLEV, WNV and ROCV envelope protein as antigens. Sera from 753 animals from São Paulo, Mato Grosso do Sul, Minas Gerais, Rio de Janeiro and Paraíba states were tested, and 271 of them were positive for SLEV (35,98%), 254 for WNV (33,73%) and 144 for ROCV (19,12%). Therefore, this ELISA has been a suitable approach for diagnosis of ancient infections by these viruses. An intense circulation of flaviviruses infecting horses was observed in the study sites. Besides, it was found, for the first time, the presence of WNV in Brazil, infecting horses from all the studied states with the only exception of Minas Gerais. Finally, serosurvey in horses proved to be an appropriate approach for surveillance of Flavivirus infections by SLEV, WNV and ROCV.
PEREIRA, A. L. "Diagnóstico Sorológico da Paracoccidioidomicose comparando os testes de Imunodifusão Dupla (IDD) e Imunoenzimático (ELISA)." Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/4543.
Full textRESUMO: A paracoccidioidomicose (PCM) é uma micose sistêmica causada pelo fungo dimórfico Paracoccidioides brasiliensis. Está entre as infecções fúngicas mais frequentes da América Latina, sendo o Brasil o país de maior endemicidade, com maior prevalência na região Sudeste. O diagnóstico considerado por muitos autores padrão-ouro para a PCM é o encontro de células fúngicas sugestivas de Paracoccidioides brasiliensis no Exame Microscópico Direto (EMD) de escarro ou outros espécimes clinico, como raspado de lesão, aspirado de linfonodos, biopsia, etc. As provas sorológicas têm grande importância, complementando ou substituindo o exame micológico no diagnóstico/prognóstico da doença. O objetivo do presente estudo foi comparar dois desses testes sorológicos para PCM: a imunodifusão dupla (IDD) e o ensaio imunoenzimático ELISA. A metodologia foi estabelecida comparando-se títulos de anticorpos obtidos de três grupos de pacientes: 142 amostras de soros de 83 pacientes com PCM (Grupo I), 49 doadores saudáveis (Grupo II) e 13 pacientes com IDD positiva para outras micoses pulmonares: 11 com histoplasmose e 2 com aspergilose (Grupo III). Nossos resultados mostraram que a 8 (9,6%) e 5 (6,0%) dos pacientes com PCM foram falso negativo ao teste de IDD e ELISA, respectivamente. Dentro do grupo de pacientes saudáveis, não houve casos de falso positivo na IDD, porém, 5 (10,2%) amostras foram positivas com títulos baixos no ELISA. Entre os 13 pacientes com outras micoses, o ELISA mostrou que 10 (77,0%) foram positivos enquanto a IDD não apresentou nenhum caso de reação cruzada. A sensibilidade do ELISA (93,9%) foi um pouco superior ao da IDD (90,3%). A especificidade do ELISA calculada como base o controle saudável e os pacientes com outras micoses foi 89,7% e 23,1%, respectivamente. A IDD mostrou uma especificidade de 100% para ambos os casos. Os valores preditivos positivos e negativos foram de 100% e 83,8% para IDD e de 88,5% e 90,3% para ELISA, respectivamente. A acurácia dos testes também foi calculada: a IDD teve 94,4% e o ELISA 86,2% de acurácia. Palavras-chave: paracoccidioidomicose, diagnóstico sorológico, títulos de a- nticorpo, Imunodifusão dupla, IDD, ensaio imunoenzimático, ELISA.
MacMillan, Alastair. "The bovine immune response following Brucella vaccination and infection and the development of a discriminatory test." Thesis, University of Surrey, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313252.
Full textYamamoto, Celia Regina Furucho. ""Diagnóstico da doença de Chagas em bancos de sangue: linfoproliferação, detecção de anticorpos e estudo epidemiológico em indivíduos com provas sorológicas inconclusivas"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/5/5134/tde-03052006-133432/.
Full textThis study aims to evaluate the contribution of lymphoproliferation (1 parameter) in association with high performance serological tests (4), epidemiological data (1) and parasitological tests (1) for Chagas disease in patients with inconclusive conventional serological tests. We showed that this diagnosis is probable in individuals presenting > three positive of these 7 parameters (15 of 73 individuals). The combination of TESA-blot, lymphoproliferation was useful when epidemiological data were positive
Parra, Andréa Cristina. "Investigação diagnóstica de doença concomitante babesiose e anaplasmose em rebanho eqüino, por técnicas de Nested PCR e c - ELISA ou ELISA indireto." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/10/10136/tde-10022011-152248/.
Full textDue to the increasing proximity between horse and man, it is of extreme importance to understand the diseases that affect horses which by chance may affect humans. Among many diseases, babesiosis and ehrlichiosis (anaplasmosis) promote high economic losses to horses herds in consequence of costs of treatment and also death, making it difficult to import and export animals: They can or not be linked affecting an animal at the same time. This study aimed to investigate and diagnose concomitant babesiosis (Babesia equi and Theileria equi) and ehrlichiosis (for ehrlichia equipment or Anaplasma phagocytophilum) in equine herds of the state of Sao Paulo, using the techniques of Nested PCR (Nested polymerase chain reaction for the diagnosis of T. equi and A. phagocytophilum) and c-ELISA (competitive enzyme-linked immunosorbent assay for diagnosis of T. equi) or ELISA (for diagnosis of A. phagocytophilum). Also to compare results obtained in these different techniques in 250 samples of horse (whole blood and serum). Results showed 38.4%, 46% and 36% positivity, respectively, in tests for the detection of Theileria equi through hematozoan, c-ELISA and Nested PCR and 0%, 3% and 0% positivity, respectively, in tests for the detection of Anaplasma phagocytophilum through blood parasites, indirect ELISA and Nested PCR. It was not observed co-infection Babesiosis and anaplasmosis in the herd study
Beaudoin, Axelle. "Développement et application d'un test ELISA pour l'étude des anticorps dirigés contre clostridium difficile." Mémoire, Université de Sherbrooke, 2009. http://savoirs.usherbrooke.ca/handle/11143/3958.
Full textSouza, Camila Giuberti de. "Avaliação da sensibilidade de diferentes testes diagnósticos para a dengue." Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/5960.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Atualmente, a Organização Mundial da Saúde considera a dengue como a mais importante doença viral transmitida por mosquitos e estima em 50 milhões o número de novas infecções a cada ano no mundo. A expansão mundial dessa doença e a demanda por testes diagnósticos rápidos, específicos e de execução simples, aumentaram o número de novos testes disponíveis no mercado. Sabe-se que, para uma melhor utilização dessas ferramentas, é fundamental sua avaliação nos diversos cenários clínicos, epidemiológicos e laboratoriais. Este trabalho teve por objetivo avaliar sete testes laboratoriais para o diagnóstico de dengue. As sensibilidades encontradas para os testes imunocromatográficos baseados na detecção de NS1 encontradas foram: 24,5% [16,2-34,4] para o Dengue Duo(Bioeasy) e 29,8% [20,8-40,1] Dengue NS1 Ag Strip (Bio-Rad). Para os testes ELISA NS1 as sensibilidades encontradas foram 43,6% [33,4-54,2] para Dengue NS1 ELISA Test (Bioeasy), e 54,3% [43,7-64,6] para PlateliaTM Dengue NS1 Ag-ELISA (BioRad). O teste NS1 que apresentou maior sensibilidade na fase aguda da doença foi o PlateliaTM (54,3%). Para todos os testes NS1 observou-se maior sensibilidade para o sorotipo 1 quando comparado com os demais sorotipos e, para o PlateliaTM, a presença de IgG influenciou negativamente na sensibilidade do teste. As sensibilidades dos testes para anticorpos IgM, variaram entre 27,1% [15,3-41,9] a 52,1% [37,2-66,7] em amostra de fase aguda, e 72,9% [53,8-81,3] a 97,9% [88,9-99,9] em fase convalescente. Todos os testes IgM apresentaram sensibilidades superiores em amostras de fase convalescente. Dentre todos os testes avaliados, o Dengue IgM ELISA Test (Bioeasy) em amostra de fase convalescente foi o que apresentou o melhor desempenho. Em amostra de fase aguda, o melhor desempenho foi obtido quando combinamos os testes PlateliaTM Dengue NS1 Ag-ELISA (BioRad) e Dengue IgM ELISA Test (Bioeasy) (76,6% [66,7-84,7]). Os resultados sugerem que testes de detecção de NS1 podem exibir sensibilidades diferentes, de acordo com o sorotipo viral e com a presença de anticorpos IgG. Além disso, nossos resultados reforçam o fato de que os estudos de avaliação de testes diagnósticos para a dengue e sua utilização devem levar em consideração o perfil epidemiológico da população
Currently, the World Health Organization considers dengue the most important viral disease transmitted by mosquitoes and it is estimated that 50 million new infections occur each year worldwide. The global spread of dengue and the demand for rapid, specific and easy to perform diagnostic tests has increased the marketing of new tests. For a better use of these tools it is essential to evaluate them in different clinical, epidemiological and laboratory settings. The aim of this study was to evaluate the sensitivity of seven laboratory tests for dengue diagnosis. The sensitivities for the NS1 immunochromatographic tests were: 24,5% [16,2 to 34,4] for Dengue Duo (Bioeasy) and 29,8% [20,8 to 40,1] for Dengue NS1 Ag strip (Bio-Rad). The sensitivities of the NS1 ELISA tests were: 43,6% for Dengue NS1 ELISA Test (Bioeasy) [33,4 to 54,2] and 54,3% [43,7 to 64,6] for PlateliaTM Dengue NS1 Ag-ELISA (BioRad). The NS1 test that demonstrated greatest sensitivity in acute phase samples was PlateliaTM (54,3%). For all NS1 tests greater sensitivity was observed for serotype 1, when compared to the others serotypes. The sensitivity of PlateliaTM (BioRad) was negatively influenced by the presence of IgG. The sensitivity of the ELISA IgM tests ranged from: 27,1% [15,3 to 41,9] to 52,1% [37,2 to 66,7] in acute phase samples and from 72,9% [53,8 to 81,3] to 97,9% [88,9 to 99,9] in convalescent phase samples. Among all the tests evaluated, Dengue IgM ELISA Test (Bioeasy), in convalescent phase samples, showed the best performance. The sensitivity in acute phase samples was 76,6% [66,7 to 84,7] when Dengue NS1 Ag test PlateliaTM ELISA (BioRad) and Dengue IgM ELISA Test (Bioeasy) were combined. Our results suggest that NS1 tests may have different sensitivities, according to the viral serotypes, and in the presence of IgG antibodies. Furthermore, our results emphasize that the epidemiological profile of the population must be considered in the use and evaluation of dengue diagnostic tests