The engorgement ratio of Simulium yahense (Diptera: Simuliidae) at the Firestone Rubber Plantation, Harbel, Liberia

Barbiero, V.K.; Trpis, M.

Journal of Medical Entomology 23(3): 309-312

1986


ISSN/ISBN: 0022-2585
PMID: 3735334
DOI: 10.1093/jmedent/23.3.309
Accession: 006671424

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Abstract
A study was conducted at the Firestone Rubber Plantation, Harbel, Liberia, to determine what proportion of the members of the Simulium damnosum complex attracted to a human successfully feed to repletion. The engorgement ratio (proportion of flies landing that feed to repletion) was evaluated at the vector subpopulation level and is expressed as a percentage of flies that land and begin to feed. The data indicate that the S. yahense population at Harbel is relatively inefficient in obtaining a blood meal. Only 25% of the S. yahense attracted successfully fed. Preliminary data from Togo indicate that S. soubrense/sanctipauli, S. damnosum/sirbanum, and S. squamosum present engorgement ratios of 75%, 45%, and 44%, respectively. The impact of feeding behavior on the transmission dynamics of Onchocerca volvulus and the interpretation of annual transmission potentials and control efforts are discussed.