Section 46
Chapter 45,036

A case of cross infection by Onchocerca volvulus and Onchocerca ochengi in Simulium damnosum S.L

Toe, L.; Adjami, A.; Bissan, Y.; Hougard, J.M.

Medecine tropicale revue du Corps de sante colonial 58(3): 269-270


ISSN/ISBN: 0025-682X
PMID: 10088105
Accession: 045035900

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During a routine entomological survey conducted within the framework of the Program to Control Onchocerciasis in West Africa, a female simulium forest fly was found to be contaminated by 13 Onchocerca volvulus larvae and 7 Onchocerca ochengi larvae. The two Onchocerca species were identified using specific DNA probes. We speculate that cross infection could be related either to behavioral factors, e.g. interruption of blood meals on two different hosts, or developmental factors, e.g. asynchronous development of parasites of the same species or specific differences in the duration of parasite cycles. Further study will be needed to determine the incidence and scope of cross infection in areas where accurate assessment of the impact of vector control on transmission of onchocerciasis in man is required.

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