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Development of Mansonella Ozzardi in a Black Fly Species of the Simulium Sanguineum Group from Eastern Vaupés, Colombia^*

Development of the microfilaria of Mansonella ozzardi to the infective stage in a species of the Simulium sanguineum group from the Mitú area, Comisaría del Vaupés, Colombia is described. Development was synchronous, and by day 6 third-stage larvae were observed in the head of flies which had fed on two naturally infected volunteers. Simulium biting activity was high from January–March, during the dry season. Only 261 blood-fed Culicoides were collected from an infected volunteer; 40% of 43 dissected on day 0 had ingested microfilariae. However, only one of 129 C. caprilesi specimens dissected after day 2 was positive, containing a second-stage larva thought to be M. ozzardi. It is concluded that Simulium, rather than Culicoides, are the principal vectors of mansonelliasis in the Mitú area.

Accepted for publication March 8, 1980.

^* Supported by grant AI-10050 from the National Institute for Allergy and Infections Diseases, National Institutes of Health.

Address reprint requests to: Dr. M. A. Tidwell, % ICMR, Tulane Medical Center, 1430 Tulane Avenue, New Orleans, Louisiana 70112.