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The isolation of the virus of Murray Valley encephalitis during the outbreak of this disease in 1951 (French, 1952), and a study of the epidemiology (Anderson, Donnelley, Stevenson, Caldwell & Eagle, 1952) led to a search the following year for the possible arthropod vector. The collection of some 43,000 mosquitoes and the examination of about 18,000 of them for Murray Valley encephalitis virus without finding this organism has been described elsewhere (Reeves, French, Marks & Kent, 1954). The present paper describes the isolation and some properties of six viruses isolated from pools of Culex fatigans and also a seventh isolated from a pool of C. annulirostris mosquitoes collected in the Mildura area of the Murray Valley. Each virus was isolated on the chorio-allantoic membrane of developing chick embryos in which situation it produced pocks. Five of the isolated viruses appear to be members of the bird pox group, while the other two, differing in the type of lesion they produce on the chorio-allantoic membrane, appear to be previously undescribed mosquito-borne viruses.

A group of viruses isolated from naturally infected mosquitoes collected in the Murray Valley area of Victoria and New South Wales