Abstract
Culex tritaeniorhynchus females infected with the microsporidian Nosema algerae, and uninfected control females were compared for susceptibility to infection with West Nile (WN) virus and for the ability to transmit virus. When fed on a high titered dose fo virus, 95% of the control females became infected, whereas only 65% of the N. algerae-infected females were infected with WN virus. However, at two lower viral doses, no differences in susceptibility were observed. No significant differences in transmission ability were found between the N. algerae-infected and control females when tested at 10, 14, and 21 days after infection with WN virus. Also, in mosquitoes dually infected with N. algerae and WN virus, neither agent affected the ability of the other to replicate.
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