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Intestinal threshold of an enzootic strain of Venezuelan encephalitis virus in Culex (Melanoconion) taeniopus mosquitoes and its implications to vector competency and vertebrate amplifying hosts

Scherer, W.F.; Cupp, E.W.; Lok, J.B.; Brenner, R.J.; Ordonez, J.V.

American Journal of Tropical Medicine and Hygiene 30(4): 862-869

1981

ISSN/ISBN: 0002-9637
PMID: 7258497
Document Number: 175362
The minimal intestinal dose of an enzootic strain of Venezuelan equine encephalitis (VEE) virus for Culex taeniopus D.B.K. caught at a marsh habitat of the virus in Guatemala was less than 5 plaque forming units (p.f.u.) of virus. Ingestion of this dose of virus in the blood of viraemic hamsters resulted in transmission of virus to other hamsters. This low intestinal threshold of an enzootic strain of VEE virus indicates that the natural Guatemalan population of C. taeniopus can acquire the virus from vertebrates that have viraemia levels as low as 1000-5000 p.f.u./ml of blood, provided other factors do not limit virus interchange between the mosquitoes and the vertebrates.

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