Abstract
Summary and Conclusions
It appears that certain species of Culex mosquitoes may act as vectors of the virus of St. Louis encephalitis. This is supported by the following evidence: 1. In certain areas Culex mosquitoes have fitted into the epidemiological picture to the extent that several workers have stressed their probable importance as vectors. 2. Virus is available to mosquitoes in the blood of doves and a number of other species of experimentally infected vertebrates. Evidence of naturally acquired infection has been demonstrated in the serum of many vertebrate hosts. 3. Infected Culex tarsalis have been collected in nature. 4. Culex pipiens has been shown to act as an experimental vector, transmission having been demonstrated to occur between the 4th and the 11th day after an infective meal. Virus persists in the mosquito for at least 13 days.
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