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Artykuły w czasopismach na temat „Onchocerca ochengi”

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Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

WAHL, G., P. ENYONG, A. NGOSSO, et al. "Onchocerca ochengi: epidemiological evidence of cross-protection against Onchocerca volvulus in man." Parasitology 116, no. 4 (1998): 349–62. http://dx.doi.org/10.1017/s003118209700228x.

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In North Cameroon, the vector of Onchocerca volvulus (causative agent of human onchocerciasis) also transmits 2 filariae of animals: O. ochengi from cattle and O. ramachandrini from wart hogs. In order to assess the qualitative and quantitative roles of these ‘animal filariae’ in the epidemiology of O. volvulus, the transmission of the 3 parasites was measured in 2 villages and related to the endemicity of human onchocerciasis. In Galim, a cattle-farming Guinea savanna village where wild animals are rare, the overwhelming majority of all filarial infections found in the Simulium damnosum s.l.

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Makepeace, Benjamin L., and Vincent N. Tanya. "25 Years of the Onchocerca ochengi Model." Trends in Parasitology 32, no. 12 (2016): 966–78. http://dx.doi.org/10.1016/j.pt.2016.08.013.

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WAHL, G., and J. M. SCHIBEL. "Onchocerca ochengi: morphological identification of the L3 in wild Simulium damnosum s.l., verified by DNA probes." Parasitology 116, no. 4 (1998): 337–48. http://dx.doi.org/10.1017/s0031182097002321.

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In order to assess the prevalence of the cattle filaria Onchocerca ochengi in onchocerciasis vectors (Simulium damnosum s.l.) in North Cameroon, we searched for a means to morphologically identify its developing larvae, which closely resemble those of O. volvulus. To this end microfilariae of the 2 Onchocerca species were isolated from slaughter cattle in Ngaoundéré and injected into neonate Simulium species. Whereas the early developmental stages (sausage stage, L2 and pre-infective larva) were indistinguishable, the infective larvae (L3) of O. ochengi were longer (median: 740 μm), more slend

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4

Morales-Hojas, R., R. A. Cheke, and R. J. Post. "Molecular systematics of five Onchocerca species (Nematoda: Filarioidea) including the human parasite, O. volvulus, suggest sympatric speciation." Journal of Helminthology 80, no. 3 (2006): 281–90. http://dx.doi.org/10.1079/joh2006331.

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AbstractThe genus Onchocerca (Nematoda: Filarioidea) consists of parasites of ungulate mammals with the exception of O. volvulus, which is a human parasite. The relationship between O. volvulus, O. ochengi and O. gibsoni remains unresolved. Based on morphology of the microfilariae and infective larvae, vector transmission and geographical distribution, O. ochengi and O. volvulus have been placed as sister species. Nevertheless, the cuticle morphology and chromosomal data (O. volvulus and O. gibsoni have n=4 while O. ochengi is n=5) suggest that O. gibsoni could be more closely related to O. vo

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5

Hansen, Rowena D. E., Alexander J. Trees, Germanus S. Bah, et al. "A worm's best friend: recruitment of neutrophils by Wolbachia confounds eosinophil degranulation against the filarial nematode Onchocerca ochengi." Proceedings of the Royal Society B: Biological Sciences 278, no. 1716 (2010): 2293–302. http://dx.doi.org/10.1098/rspb.2010.2367.

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Onchocerca ochengi , a filarial parasite of cattle, represents the closest relative of the human pathogen, Onchocerca volvulus . Both species harbour Wolbachia endosymbionts and are remarkable in that adult female worms remain viable but sessile for many years while surrounded by host cells and antibodies. The basis of the symbiosis between filariae and Wolbachia is thought to be metabolic, although a role for Wolbachia in immune evasion has received little attention. Neutrophils are attracted to Wolbachia , but following antibiotic chemotherapy they are replaced by eosinophils that degranulat

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6

WAHL, G., D. EKALE, and A. SCHMITZ. "Onchocerca ochengi: assessment of the Simulium vectors in North Cameroon." Parasitology 116, no. 4 (1998): 327–36. http://dx.doi.org/10.1017/s0031182097002333.

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In the savanna areas of tropical Africa, cattle are frequently infected with the filaria Onchocerca ochengi. This parasite is closely related to Onchocerca volvulus, the causative agent of human onchocerciasis (river blindness), and is capable of developing in the same vector, Simulium damnosum s.l. In North Cameroon, where both O. ochengi and O. volvulus are endemic, we carried out a field study (reported in this and 2 following papers) to examine to which extent the transmission of the 2 parasite species overlap and what influence this has on the epidemiology of human onchocerciasis. In this

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7

Trees, A. J. "Onchocerca ochengi: Mimic, model or modulator of O. volvulus?" Parasitology Today 8, no. 10 (1992): 337–39. http://dx.doi.org/10.1016/0169-4758(92)90068-d.

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8

ACHUKWI, M. D., W. HARNETT, P. ENYONG, and A. RENZ. "Successful vaccination against Onchocerca ochengi infestation in cattle using live Onchocerca volvulus infective larvae." Parasite Immunology 29, no. 3 (2007): 113–16. http://dx.doi.org/10.1111/j.1365-3024.2006.00917.x.

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9

Jaleta, Tegegn G., Christian Rödelsperger, Babette Abanda, et al. "Full mitochondrial and nuclear genome comparison confirms that Onchocerca sp. “Siisa” is Onchocerca ochengi." Parasitology Research 117, no. 4 (2018): 1069–77. http://dx.doi.org/10.1007/s00436-018-5783-0.

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10

Mbobda, Alexis Sylvain Wafo, Alain Wembe Ngouonpe, Gervais Mouthé Happi, et al. "Pachypodostyflavone, a New 3-methoxy Flavone and Other Constituents with Antifilarial Activities from the Stem Bark of Duguetia staudtii." Planta Medica International Open 8, no. 02 (2021): e56-e61. http://dx.doi.org/10.1055/a-1492-3585.

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AbstractA new flavone derivative named pachypodostyflavone (1), along with 8 known compounds (2–9) and a mixture of β-sitosterol and stigmasterol were isolated from the stem bark of Duguetia staudtii (Annonaceae), based on a bioassay-guided fractionation. Their structures were determined using high-resolution mass spectrometry and NMR spectroscopic data, as well as by comparison with the literature values of their analogs. Selected isolated compounds were evaluated for their in vitro antifilaricidal activities on Onchocerca ochengi microfilariae and adult worms. Inhibition of motility was eval

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11

Babiaka, Smith B., Conrad V. Simoben, Kennedy O. Abuga, et al. "Alkaloids with Anti-Onchocercal Activity from Voacanga africana Stapf (Apocynaceae): Identification and Molecular Modeling." Molecules 26, no. 1 (2020): 70. http://dx.doi.org/10.3390/molecules26010070.

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A new iboga-vobasine-type isomeric bisindole alkaloid named voacamine A (1), along with eight known compounds—voacangine (2), voacristine (3), coronaridine (4), tabernanthine (5), iboxygaine (6), voacamine (7), voacorine (8) and conoduramine (9)—were isolated from the stem bark of Voacangaafricana. The structures of the compounds were determined by comprehensive spectroscopic analyses. Compounds 1, 2, 3, 4, 6, 7 and 8 were found to inhibit the motility of both the microfilariae (Mf) and adult male worms of Onchocerca ochengi, in a dose-dependent manner, but were only moderately active on the a

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12

TREES, A. J., S. P. GRAHAM, A. RENZ, A. E. BIANCO, and V. TANYA. "Onchocerca ochengi infections in cattle as a model for human onchocerciasis: recent developments." Parasitology 120, no. 7 (2000): 133–42. http://dx.doi.org/10.1017/s0031182099005788.

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The bovine parasite Onchocerca ochengi is a nodule-dwelling filarial nematode, closely related to O. volvulus, the causal agent of human River Blindness, and, sharing with it, the same vector. This brief review, based on a presentation at the BSP Autumn Symposium 1999, describes recent work supported by the WHO Drug Development Research Macrofil programme and the Edna McConnell Clark Foundation vaccine development programme, to research the chemotherapy and immunology of onchocerciasis utilising this model system, with experimental infections in Liverpool and field infections in northern Camer

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13

Tritten, Lucienne, Maeghan O’Neill, Chuck Nutting, et al. "Loa loa and Onchocerca ochengi miRNAs detected in host circulation." Molecular and Biochemical Parasitology 198, no. 1 (2014): 14–17. http://dx.doi.org/10.1016/j.molbiopara.2014.11.001.

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14

McCall, P. J., H. Townson, and A. J. Trees. "Morphometric differentiation of Onchocerca volvulus and O. ochengi infective larvae." Transactions of the Royal Society of Tropical Medicine and Hygiene 86, no. 1 (1992): 63–65. http://dx.doi.org/10.1016/0035-9203(92)90443-g.

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15

Cross, H. F., A. Renz, and A. J. Trees. "In-vitro uptake of ivermectin by adult male Onchocerca ochengi." Annals of Tropical Medicine & Parasitology 92, no. 6 (1998): 711–20. http://dx.doi.org/10.1080/00034983.1998.11813331.

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H. F. CROSS, B. M. BRONSVOORT, G. W, BY. "The entry of ivermectin and suramin into Onchocerca ochengi nodules." Annals of Tropical Medicine And Parasitology 91, no. 4 (1997): 393–402. http://dx.doi.org/10.1080/00034989761012.

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F. CROSS A. RENZ A. J. TREES, H. "In vitro uptake of ivermectin by adult male Onchocerca ochengi." Annals of Tropical Medicine And Parasitology 92, no. 6 (1998): 711–20. http://dx.doi.org/10.1080/00034989859177.

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HAGEN, H. E., and S. L. KLÄGER. "Integrin-like RGD-dependent cell adhesion mechanism is involved in the rapid killing of Onchocerca microfilariae during early infection of Simulium damnosum s.l." Parasitology 122, no. 4 (2001): 433–38. http://dx.doi.org/10.1017/s0031182001007545.

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Injection trials with compatible and non-compatible Onchocerca species into S. damnosum s.l., the vector of human and bovine onchocerciasis, demonstrated that the rapid killing of microfilariae within the blackfly's haemocoel is species specific. In the presence of the peptide RGDS as a blocking agent for integrin-like receptors of haemocytes, the survival of O. ochengi microfilariae in its natural intermediate host was significantly increased. This increased survival 24 h p.i. correlated with a significant decrease of apoptosis levels in the microfilariae following a 2 h exposure to the haemo

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Djongra, Mathieu1 Mando Ndou Bertrand1 Djafsia Boursou1 Tchuenguem Fohouo Fernand-Nestor1 Ndjonka Dieudonné1*, Ndou Bertrand Mando, Boursou Djafsia, Fohouo Fernand-Nesto Tchuenguem, and Dieudonné Ndjonka. "In vitro evaluation of the Anthelmintic Activity of PROMAX-C and propolis extract on the Nematode Parasite Onchocerca ochengi Bwangamoi, 1969 (Spirurida: Onchocercidae)." American Journal of PharmTech Research 12, no. 3 (2022): 36–54. https://doi.org/10.5281/zenodo.7103236.

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ABSTRACT The anthelmintic activity of the ethanolic and aqueous extracts of Foumban propolis and PROMAX-C was evaluated <em>in vitro</em>, on the nematode parasite of cattle <em>Onchocerca ochengi</em>. The objective of this study was to find an alternative of synthetic anthelmintic to fight human and animal onchocerciasis. Increasing concentrations of ethanolic and aqueous extracts of propolis and PROMAX-C were prepared in RPMI 1640 culture medium for <em>O. ochengi</em> incubation. Dimethylsulfoxide of 0.5 % concentration was the negative control and the positive control was ivermectin. The

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20

KLÄGER, S. L., H. E. HAGEN, and J. E. BRADLEY. "Effects of an Onchocerca-derived cysteine protease inhibitor on microfilariae in their simuliid vector." Parasitology 118, no. 3 (1999): 305–10. http://dx.doi.org/10.1017/s0031182098003795.

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A recombinant cysteine protease inhibitor, onchocystatin of the parasitic nematode Onchocerca volvulus, was tested for its role in microfilarial development in the simuliid vector. Onchocystatin was found to be present in female adults and skin microfilariae of the bovine parasite O. ochengi, the closest relative of O. volvulus. In addition the inhibitor could be detected as an excretory–secretory (E–S) product of the microfilariae. Co-injection of onchocystatin and the O. ochengi microfilariae into the surrogate vector Simulium ornatum s.l. significantly enhanced the recovery rates of the par

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21

Bah, Germanus S., Sebastian Schneckener, Steffen R. Hahnel, et al. "Emodepside targets SLO-1 channels of Onchocerca ochengi and induces broad anthelmintic effects in a bovine model of onchocerciasis." PLOS Pathogens 17, no. 6 (2021): e1009601. http://dx.doi.org/10.1371/journal.ppat.1009601.

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Onchocerciasis (river blindness), caused by the filarial worm Onchocerca volvulus, is a neglected tropical disease mostly affecting sub-Saharan Africa and is responsible for >1.3 million years lived with disability. Current control relies almost entirely on ivermectin, which suppresses symptoms caused by the first-stage larvae (microfilariae) but does not kill the long-lived adults. Here, we evaluated emodepside, a semi-synthetic cyclooctadepsipeptide registered for deworming applications in companion animals, for activity against adult filariae (i.e., as a macrofilaricide). We demonstrate

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22

Cho-Ngwa, Fidelis, Monique Akoachere, and Vincent P. K. Titanji. "Sensitive and specific serodiagnosis of river blindness using Onchocerca ochengi antigens." Acta Tropica 89, no. 1 (2003): 25–32. http://dx.doi.org/10.1016/j.actatropica.2003.08.003.

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Determann, A., H. Mehlhorn, and F. A. Ghaffar. "Electron microscope observations on Onchocerca ochengi and O. fasciata (Nematoda: Filarioidea)." Parasitology Research 83, no. 6 (1997): 591–603. http://dx.doi.org/10.1007/s004360050303.

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Vuong, P. N., S. Wanji, J. Prod'Hon, and O. Bain. "Nodules sous-cutanés et lésions cutanées engendrés par diverses onchocerques chez des bovins africains." Revue d’élevage et de médecine vétérinaire des pays tropicaux 47, no. 1 (1994): 47–51. http://dx.doi.org/10.19182/remvt.9131.

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Des nodules sous-cutanés et de la peau ombilicale sont prélevés sur 6 Bos indicus onchocerquiens au Cameroun, pour l'étude anatomopathologiq ue. Les nodules à Onchocerca ochengi et Onchocerca dukei ont la même structure que celle des nodules à Onchocerca volvulus de l'homme; ce sont des pseudo-kystes inflammatoire contenant souvent une fillaire femelle. La composante cellulaire de la paroi du pseudo-kyste permet de classer les nodules en trois types : nodule "jeune", nodule "évolué" et nodule "ancien". Le nodule est circonscrit par des vaisseaux dont la lumière contient parfois des microfilair

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TCHAKOUTÉ, V. L., M. BRONSVOORT, V. TANYA, A. RENZ, and A. J. TREES. "Chemoprophylaxis of Onchocerca infections: in a controlled, prospective study ivermectin prevents calves becoming infected with O. ochengi." Parasitology 118, no. 2 (1999): 195–99. http://dx.doi.org/10.1017/s0031182098003680.

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Onchocerciasis (‘River Blindness’), caused by the filarial nematode Onchocerca volvulus is of major public health importance in West Africa. Ivermectin, a drug originally developed for veterinary use, is now being incorporated in control strategies but whilst it has potent efficacy against L1 larvae (microfilariae), ivermectin is not lethal to adult (L5) O. volvulus, nor to adults of the related cattle parasite O. ochengi. We have exploited this model to determine if ivermectin has prophylactic activity against naturally transmitted, O. ochengi infections in a controlled, prospective study in

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Djetoloum, Martinien Atakewang, Nadlaou Bessimbaye, and Mbaïnguinam Mbailao. "In Vitro Study of the Antiparasitic Activity of Vitellaria paradoxa Gaertn (Sapotaceae) on the Parasite Onchocerca ochengi." Scholars Academic Journal of Biosciences 12, no. 01 (2024): 5–15. http://dx.doi.org/10.36347/sajb.2024.v12i01.002.

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Onchocerciasis is a parasitic disease that affects millions of animals and people around the world. A recipe based on Vitellaria paradoxa is used in traditional medicine against this disease in Chad. The objective of this study was to evaluate the antiparasitic activities of extracts from the roots, fruits, leaves and bark of Vitellaria paradoxa on the parasitic nematode Onchocerca ochengi, a model similar to Onchocerca volvulus used in the research of control drugs. against onchocerciasis. The identification of parasites and the hydroethanolic extracts of the different planar organs were carr

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Ndjonka, D., C. Agyare, K. Lüersen, et al. "In vitro activity of Cameroonian and Ghanaian medicinal plants on parasitic (Onchocerca ochengi) and free-living (Caenorhabditis elegans) nematodes." Journal of Helminthology 85, no. 3 (2010): 304–12. http://dx.doi.org/10.1017/s0022149x10000635.

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AbstractEthanolic and aqueous extracts of selected medicinal plants from Cameroon and Ghana were assessed for their in vitro anthelmintic activity by using the bovine filarial parasite Onchocerca ochengi and the free living nematode Caenorhabditis elegans, a model organism for research on nematode parasites. Worms were incubated in the presence of different concentrations of extracts and inhibitory effects were monitored at different time points. Among the extracts used in this study, ethanolic extracts of Anogeissus leiocarpus, Khaya senegalensis, Euphorbia hirta and aqueous extracts from Ann

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Hagen, H. E., J. Grunewald, and P. J. Ham. "Induction of the prophenoloxidase-activating system of Simulium (Diptera: Simuliidae) following Onchocerca (Nematoda: Filarioidea) infection." Parasitology 109, no. 5 (1994): 649–55. http://dx.doi.org/10.1017/s0031182000076538.

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Trials were carried out to study the humoral immune response of blackflies to filariae following infection using the intrathoracic injection technique. An induced 66 kDa protein was abundant in the haemolymph of the European species Simulium ornatum following infection with bovine Onchocerca lienalis. This protein was apparently at higher concentrations in the haemolymph of sham-inoculated flies, i.e. flies that received sterile medium without the parasites. A molecule of the same size was also observed in the haemolymph of infected S. damnosum s.l. following infection with human O. volvulus o

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Graham, Simon P., Alexander J. Trees, Robert A. Collins, et al. "Down-Regulated Lymphoproliferation Coincides with Parasite Maturation and with the Collapse of Both Gamma Interferon and Interleukin-4 Responses in a Bovine Model of Onchocerciasis." Infection and Immunity 69, no. 7 (2001): 4313–19. http://dx.doi.org/10.1128/iai.69.7.4313-4319.2001.

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ABSTRACT Onchocerciasis is a debilitating parasitic infection caused by the filarial nematode Onchocerca volvulus. Infections are chronic, and persistence of the parasites for several years argues for highly adapted mechanisms of immune evasion. Due to the restricted host repertoire of O. volvulus, we have used the cattle parasite Onchocerca ochengi to investigate the nature of immunomodulation underpinning these long-term infections. Cattle were infected with a single inoculation of 350 infective-stage larvae under laboratory conditions (n = 6). Intradermal nodules containing immature adult w

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Eberle, Raphael, Norbert W. Brattig, Maria Trusch, et al. "Isolation, identification and functional profile of excretory–secretory peptides from Onchocerca ochengi." Acta Tropica 142 (February 2015): 156–66. http://dx.doi.org/10.1016/j.actatropica.2014.11.015.

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Ignagali, Banserne Brey, Borris Rosnay Galani Tietcheu, Theodore Betrosse, Blaise Kamaya, and Dieudonne Ndjonka. "In Vitro Filaricidal Properties of Aqueous Extracts of Combretum nigricans (Combretaceae) on Onchocerca ochengi (Onchocercidae)." Journal of Parasitology Research 2024 (January 31, 2024): 1–11. http://dx.doi.org/10.1155/2024/2119056.

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Aim. Onchocerciasis is an endemic parasitic disease in sub-Saharan Africa that significantly impacts animal and human health. In Northern Cameroon, medicinal plants from the Combretum genus are used for onchocerciasis traditional treatment although there is no scientific evidence of their antifilarial potential. This study evaluates the in vitro macro- and microfilaricidal properties of water extracts from Combretum nigricans in Onchocerca ochengi. Material and Methods. O. ochengi microfilariae and adult male worms were recovered from cowhide fragments. Oxidative stress indicators and motility

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Hildebrandt, Julia C., Albert Eisenbarth, Alfons Renz, and Adrian Streit. "Reproductive biology of Onchocerca ochengi, a nodule forming filarial nematode in zebu cattle." Veterinary Parasitology 205, no. 1-2 (2014): 318–29. http://dx.doi.org/10.1016/j.vetpar.2014.06.006.

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GRAHAM, S. P., Y. WU, K. HENKLE-DUEHRSEN, et al. "Patterns of Onchocerca volvulus recombinant antigen recognition in a bovine model of onchocerciasis." Parasitology 119, no. 6 (1999): 603–12. http://dx.doi.org/10.1017/s0031182099005065.

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The antibody responses of 8 cattle experimentally infected with Onchocerca ochengi to 18 recombinant O. volvulus antigens were measured by ELISA. In addition to establishing antigenic cross-reactivity between the species, the dynamics of antigen-specific responses were examined to assess how the recognition of the antigens compared to the known stage-specificity of expression. Six cattle responded to all of the antigens and 2 animals responded to all but 1. The dynamics of the recognition of 4 antigens (B20, MOv-2, MOv-14 and OvNHR2 02E1) were characterized by rapid seroconversion following in

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Ayiseh, Rene Bilingwe, Glory Enjong Mbah, Elvis Monya, et al. "Development and validation of small animal models for onchocerciasis and loiasis microfilaricide discovery." PLOS Neglected Tropical Diseases 17, no. 2 (2023): e0011135. http://dx.doi.org/10.1371/journal.pntd.0011135.

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Background Onchocerciasis (river blindness) caused by the filarial worm Onchocerca volvulus is a neglected tropical disease that affects the skin and eyes of humans. Mass drug administration with ivermectin (IVM) to control the disease often suffers from severe adverse events in individuals co-injected with high loads of Loa loa microfilariae (mf). Thus loiasis animal models for counter-screening of compounds effective against onchocerciasis are needed, as are the corresponding onchocerciasis screening models. The repertoire of such models is highly limiting. Therefore, this study was aimed at

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Akafyi, Danlami Elisha, Iliya Shehu Ndams, Ishaya Haruna Nock, et al. "Emergence and genetic diversity of zoonotic Onchocerca species among human populations in Taraba State, Nigeria." German Journal of Microbiology 3, no. 2 (2023): 12–19. http://dx.doi.org/10.51585/gjm.2023.2.0023.

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In the present study, the genetic diversity of Onchocerca (O.) species was investigated by amplifying a fragment of the 16S rRNA gene from the parasite obtained in some endemic areas in Taraba State, Nigeria. Three local government areas were selected: two onchocerciasis-endemic and one non-onchocerciasis-endemic regions. A total of 211 skin snips using a sterile sclera punch were obtained from consenting participants, males and females residing within the areas for at least ten years or since birth, by convenience sampling methods. The emerged microfilariae were examined microscopically. Nine

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Justin, Kalmobé, Ndjonka Dieudonné, Vildina Dikti Jacqueline, and Liebau Eva. "Antifilarial Activity of Cucurbita pepo ovifera var ovifera (Cucurbitaceae) on Onchocerca ochengi Adult Worms." British Journal of Pharmaceutical Research 17, no. 2 (2017): 1–8. https://doi.org/10.9734/BJPR/2017/33381.

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One of the strategies for developing novel pharmaceutical drugs is to use natural sources such as plants for therapeutic treatment. Plant extracts are a cocktail of compounds which act synergically and can improve treatment effectiveness, reduce therapeutic duration and resistance. The ethanolic extracts of leaves and seeds of <em>Cucurbita pepo ovifera</em> <em>var</em> <em>ovifera</em> from Sudano-Guinean and Sudano-Sahelian zones of Cameroon were evaluated on the cattle parasite nematode <em>Onchocerca</em><em> ochengi</em>. Worms were incubated with different concentrations of the plant ex

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Tiku, Tiku Edward, Moses Samje, Napoleon Mfonku, and Fidelis Cho-Ngwa. "Anti-Onchocercal Properties of Extracts of Scoparia dulcis and Cylicodiscus gabunensis." Journal of Tropical Medicine 2022 (November 16, 2022): 1–8. http://dx.doi.org/10.1155/2022/4279689.

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Introduction. The elimination of onchocerciasis is hampered by the absence of suitable drugs that are effective against adult filariae. This study is aimed at assessing the anti-onchocercal effects of extracts of Scoparia dulcis and Cylicodiscus gabunensis that could serve as drug leads against onchocerciasis. Methods. Different parts of the plants (Scoparia dulcis and Cylicodiscus gabunensis) were extracted with hexane, methylene chloride, and methanol. The extracts were tested in vitro against the bovine model parasite, Onchocerca ochengi. Adult female worm viability was determined biochemic

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Luu, Lisa, Germanus S. Bah, Ndode Herman Okah-Nnane, et al. "Co-Administration of Adjuvanted Recombinant Ov-103 and Ov-RAL-2 Vaccines Confer Protection against Natural Challenge in A Bovine Onchocerca ochengi Infection Model of Human Onchocerciasis." Vaccines 10, no. 6 (2022): 861. http://dx.doi.org/10.3390/vaccines10060861.

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Onchocerciasis (river blindness), caused by the filarial nematode Onchocerca volvulus, is a neglected tropical disease mainly of sub-Saharan Africa. Worldwide, an estimated 20.9 million individuals live with infection and a further 205 million are at risk of disease. Current control methods rely on mass drug administration of ivermectin to kill microfilariae and inhibit female worm fecundity. The identification and development of efficacious vaccines as complementary preventive tools to support ongoing elimination efforts are therefore an important objective of onchocerciasis research. We eval

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Rakwa, Enock Enock, Benoît Bargui Koubala, Bertrand Ndou Mando, Mathieu Djongra, Francis Nveikoueing, and Dieudonné Ndjonka. "Antifilarial Activity of the Methanolic Extract of Indigofera tinctoria (Fabaceae) on Bovine Parasites (Onchocerca ochengi)." Journal of Parasitology Research 2022 (October 8, 2022): 1–10. http://dx.doi.org/10.1155/2022/7828551.

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Onchocerciasis is a major public health problem caused by Onchocerca volvulus parasite and transmitted to humans via black flies (simulium) bites. The control of onchocerciasis relies much on the use of the chemical drug ivermectin, which is only effective against microfilariae and has led to drug resistance. This study was carried out to assess the in vitro antifilarial activity of methanolic extract of Indigofera tinctoria and its most active fractions on adult male O. ochengi worm, the closest model to O. volvulus, after 48 h and 72 h of treatment. Worms’ viability was determined biochemica

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Kalmobé, Justin, Dieudonné Ndjonka, Jacqueline Dikti, and Eva Liebau. "Antifilarial Activity of Cucurbita pepo ovifera var ovifera (Cucurbitaceae) on Onchocerca ochengi Adult Worms." British Journal of Pharmaceutical Research 17, no. 2 (2017): 1–8. http://dx.doi.org/10.9734/bjpr/2017/33381.

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Nfon, Charles K., Benjamin L. Makepeace, Leo M. Njongmeta, Vincent N. Tanya, Odile Bain, and Alexander J. Trees. "Eosinophils contribute to killing of adult Onchocerca ochengi within onchocercomata following elimination of Wolbachia." Microbes and Infection 8, no. 12-13 (2006): 2698–705. http://dx.doi.org/10.1016/j.micinf.2006.07.017.

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Boussinesq, Michel, Peter Enyong, Patrick Chounna-Ndongmo, et al. "Effects of an injectable long-acting formulation of ivermectin on Onchocerca ochengi in zebu cattle." Parasite 27 (2020): 36. http://dx.doi.org/10.1051/parasite/2020036.

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The availability of a safe macrofilaricidal drug would help to accelerate onchocerciasis elimination. A trial was conducted in Cameroon to evaluate the effects of a subcutaneous injectable long-acting formulation of ivermectin (LAFI) on the microfilariae (mf) and adult stages of Onchocerca ochengi. Ten zebu cattle naturally infected with the parasite were injected subcutaneously with either 500 mg (group A, N = 4), or 1000 mg long-acting ivermectin (group B, N = 4) or the vehicle (group C, N = 2). Skin samples were collected from each animal before, and 6, 12, and 24 months after treatment to

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Ndjonka, D., E. D. Abladam, B. Djafsia, I. Ajonina-Ekoti, M. D. Achukwi, and E. Liebau. "Anthelmintic activity of phenolic acids from the axlewood tree Anogeissus leiocarpus on the filarial nematode Onchocerca ochengi and drug-resistant strains of the free-living nematode Caenorhabditis elegans." Journal of Helminthology 88, no. 4 (2013): 481–88. http://dx.doi.org/10.1017/s0022149x1300045x.

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AbstractThe effect of three phenols (ellagic, gentisic and gallic acids) from the axlewood tree Anogeissus leiocarpus on Onchocerca ochengi and drug-resistant strains of Caenorhabditis elegans, a model organism for research on nematode parasites, is investigated. Worms were incubated in different concentrations of phenols and their survival was monitored after 48 h. Among the three acids, ellagic acid strongly affected the survival of O. ochengi microfilariae, O. ochengi adults, a wild-type C. elegans and anthelmintic-resistant strains of C. elegans, namely albendazole (CB3474), levamisole (CB

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Bissan, Y., H. F. Ake, I. Toe, and J.-M. Hougard. "Impact of onchocerciasis control on the transmission of Onchocerca volvulus, onchocerca ochengi and other Oncherca species by Simulium sirbanum in West Africa." Parasitology International 47 (August 1998): 108. http://dx.doi.org/10.1016/s1383-5769(98)80225-0.

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Menga, Honoré, Dieudonné Ndjonka, and Remy Mimpfoundi. "Anthelmintic Activity, Acute Toxicity of Anacardium occidentale L. (Anacardiaceae) on Onchocerca ochengi and Caenorhabditis elegans." Asian Journal of Medicine and Health 5, no. 3 (2017): 1–12. http://dx.doi.org/10.9734/ajmah/2017/34454.

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Hagen, Hans‐E, Sabine L. Kläger, and Gwyn T. Williams. "Is apoptosis involved in mechanisms to eliminate Onchocerca ochengi during Simulium damnosum s.l. immune response?" Tropical Medicine & International Health 3, no. 12 (1998): 945–50. http://dx.doi.org/10.1046/j.1365-3156.1998.00331.x.

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deC Bronsvoort, Barend M., Benjamin L. Makepeace, Alfons Renz, et al. "UMF-078: A modified flubendazole with potent macrofilaricidal activity against Onchocerca ochengi in African cattle." Parasites & Vectors 1, no. 1 (2008): 18. http://dx.doi.org/10.1186/1756-3305-1-18.

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NFON, CHARLES K., VINCENT N. TANYA, ALEXANDER J. TREES, BENJAMIN L. MAKEPEACE, and LEO M. NJONGMETA. "LACK OF RESISTANCE AFTER RE-EXPOSURE OF CATTLE CURED OF ONCHOCERCA OCHENGI INFECTION WITH OXYTETRACYCLINE." American Journal of Tropical Medicine and Hygiene 76, no. 1 (2007): 67–72. http://dx.doi.org/10.4269/ajtmh.2007.76.67.

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Denke, A. M. "A comparison between the lengths of microfilariae of Onchocerca ochengi and O. volvulus in Mali." Transactions of the Royal Society of Tropical Medicine and Hygiene 79, no. 5 (1985): 734–35. http://dx.doi.org/10.1016/0035-9203(85)90209-3.

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Hildebrandt, Julia C., Albert Eisenbarth, Alfons Renz, and Adrian Streit. "Single worm genotyping demonstrates that Onchocerca ochengi females simultaneously produce progeny sired by different males." Parasitology Research 111, no. 5 (2012): 2217–21. http://dx.doi.org/10.1007/s00436-012-2983-x.

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