Abstract
Outbreaks of Pasteurella anatipestifer infections in California turkey flocks were investigated and found to have a seasonal distribution, with a peak incidence in fall, coinciding with peak Culex mosquito populations. An experiment was conducted to test the hypothesis that mosquitoes may serve as vectors for P. anatipestifer infections in turkeys. Four 7-week-old turkey poults were exposed for 7 days to mosquitoes captured from turkey barns during a field outbreak of P. anatipestifer serotype 1 infection. One turkey developed serum antibodies to serotype 1, detectable by enzyme-linked immunosorbant assay, and was resistant to an intravenous inoculation of P. anatipestifer serotype 1 at 4 weeks postexposure. Giemsa-stained blood smears from this bird and from three 7-week-old turkeys inoculated intravenously with P. anatipestifer revealed the presence of rod-shaped bacteria in or on the surface of host erythrocytes. No such rod-shaped bodies were found on erythrocytes of an uninoculated control turkey.
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