Multiplication of Whataroa Virus in Mosquitoes

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Abstract
Whataroa virus readily infects Aedes australis when either injected into the hemocoel or fed. Culiseta tonnoiri, from which the virus has been isolated in nature, can also be readily infected by injection or by feeding on viremic suckling mice. A high proportion of individuals of Ae. australis will transmit virus after 17 days extrinsic incubation at 20°C. Transmissions were also obtained in a few cases with C. tonnoiri. In Ae. australis infected by feeding, the maximum titer in the salivary glands is not reached earlier than the 17th day at 20°C. In a proportion of Ae. australis, virus can be shown to leak into the hemocoel shortly after the insects have engorged but this does not account for the high proportion in which virus eventually generalizes. The virus appears to be well adapted to survive in the habitat in which it has been studied.

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