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The Effect of Multiple Host Contacts on the Infectivity of Dengue-2 Virus-Infected Aedes aegypti
John L. Putnam and Thomas W. Scott
The Journal of Parasitology
Vol. 81, No. 2 (Apr., 1995), pp. 170-174
Stable URL: http://www.jstor.org/stable/3283915
Page Count: 5
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This study was designed to determine if transmission rates for dengue-2 virus by Aedes aegypti are altered by mosquitos probing a host for blood or imbibing blood prior to attempting transmission. Aedes aegypti is known to contact multiple hosts during each egg-laying cycle and multiple host contacts might diminish the amount of virus in infected mosquito's salivary glands or ducts and render them functionally uninfective. Probing a host 5, 10, or 20 consecutive times did not significantly alter the infectivity of parenterally infected mosquitoes. However, orally infected Ae. aegypti that probed 20 times transmitted dengue viruses at a significantly higher rate than controls. Infectivity of orally infected Ae. aegypti was unaffected by blood feeding. Our data suggest that (1) dengue virus-infected Ae. aegypti remain infective regardless of their probing or engorging history, and (2) once Ae. aegypti become infective they are extremely efficient disseminators of dengue virus.
The Journal of Parasitology © 1995 The American Society of Parasitologists