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Studies on Onchocerca gutturosa (Neumann, 1910) and its Development in Simulium Ornatum (Meigen, 1818). 3. Factors Affecting the Development of the Parasite in its Vector*

Published online by Cambridge University Press:  05 June 2009

D. A. Eichler
D. A. Eichler
Affiliation:
London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT
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Extract

1. Observations were made on various methods of infecting S. ornatum with 0. gutturosa, the behaviour of the parasite in its vector, and the maintenance of the vector in the laboratory.

2. S. ornatum reared from pupae brought into the laboratory were successfully infected with 0. gutturosa after feeding on infected cattle. The use of in vitro methods of infection was unsuccessful as microfilariae were ingested but did not undergo larval development.

3. The migratory route of 0. gutturosa microfilariae ingested by S. ornatum was studied and it was found that a mean of only 25% penetrate out of the abdominal midgut. The dimensional changes of 0. gutturosa were noted from the time of ingestion by S. ornatum until the infective stage was reached.

4. 0. gutturosa took 13–15 days to reach the infective stage in S. ornatum when maintained at a constant temperature of 23°C.

5. The development and structure of the peritrophic membrane of S. ornatum are described.

6. Preliminary observations on the seasonal variations of some factors affecting the transmission of O. gutturosa by S. ornatum suggest that microfilariae were only available for ingestion during the period of vector activity, after which they migrated into the deeper regions of the skin of cattle.

Type
Research Article
Information
Journal of Helminthology , Volume 47 , Issue 1 , March 1973 , pp. 73 - 88
Copyright
Copyright © Cambridge University Press 1973

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