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Lack of resistance after re-exposure of cattle cured of Onchocerca ochengi infection with oxytetracycline.

Nfon, C.K., Makepeace, Benjamin L., Njongmeta, L.M., Tanya, V. N. and Trees, Alexander J. (2007) 'Lack of resistance after re-exposure of cattle cured of Onchocerca ochengi infection with oxytetracycline.'. American Journal of Tropical Medicine and Hygiene, Vol 76, Issue 1, pp. 67-72.

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Although vector control and ivermectin chemotherapy have led to a dramatic reduction in the incidence of river blindness (onchocerciasis), there is a consensus that additional control tools are required to sustain and extend this success. The recognition of endosymbiotic bacteria (Wolbachia) in filariae and their targeting by antibiotics constitutes the most significant and practicable opportunity for a macrofilaricidal therapy in the short-to-medium-term. Using Onchocerca ochengi in cattle, an analog of human onchocerciasis, we have previously shown that oxytetracycline is macrofilaricidal, and protective immunity exists naturally in a subset of animals termed putatively immune. Here, we report that although 24 weeks of weekly oxytetracycline treatment eliminated adult worms, cured animals remained susceptible to re-infection by natural challenge when compared with putatively immune cattle. However, their susceptibility was not significantly different from that of concurrently exposed, heavily infected animals. Thus, cattle cured by oxytetracycline are neither hypo-susceptible nor hyper-susceptible.

Item Type: Article
Uncontrolled Keywords: bovine model endosymbiotic bacteria ivermectin treatment filarial nematodes immune-responses wolbachia chemotherapy volvulus tetracycline transmission
Subjects: QX Parasitology > QX 45 Host-parasite relations
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 885 Onchocerciasis
Faculty: Department: Groups (2002 - 2012) > Veterinary Parasitology Group (2002-2008)
Related URLs:
Depositing User: Ms Julia Martin
Date Deposited: 20 Sep 2010 14:11
Last Modified: 06 Feb 2018 13:01


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