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Limited fly load and development of Onchocerca volvulus microfilariae in Guatemalàn Simulium ochraceum†

Published online by Cambridge University Press:  18 November 2009

Y. Hashiguchi ,
M. Kawabata ,
S. Ito  and
M. M. Recinos C
Y. Hashiguchi
Affiliation:
Department of Parasitology, Kochi Medical School, Nankoku City, Kochi 781–51, Japan
M. Kawabata
Affiliation:
Department of Parasitology, National Institute of Health, Tokyo, Japan
S. Ito
Affiliation:
Department of Parasitology, Kochi Medical School, Nankoku City, Kochi 781–51, Japan Department of Medical Zoology, Osaka Prefectural Institute of Health, Japan
M. M. Recinos C
Affiliation:
National Department for Malaria Eradication, Ministry of Public Health, Guatemala
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Abstract

Fly load of Onchocerca volvulus microfilariae and their early development in Simulium ochraceum were examined at intervals of 10, 30 and 60 min after ingestion and then hourly up to 72 hours. Many microfilariae ingested were damaged by the cibarial armature of the vector, limiting the fly load, but some of these damaged microfilariae were able to penetrate the gut before they died. Thus, the mean number of the living parasites per fly in the head and thorax decreased gradually with elapse of time after ingestion. The parasites ingested by S. ochraceum did not develop beyond the microfilarial stages during the first 24 hours; thereafter only thoracic forms (lst-stage larvae) were found to be alive. The high mortality of the infected fly might be caused by the high intakes of microfilariae and also by normal and/or partly wounded microfilariae invading various organs. The numbers of microfilaria ingested from different biting sites were usually high in comparison with the densities observed in each site; this indicates that the microfilariae might be attracted by the biting females.

Type
Research Article
Information
Journal of Helminthology , Volume 55 , Issue 3 , September 1981 , pp. 189 - 196
Copyright
Copyright © Cambridge University Press 1981

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