Abstract
Field studies during an epidemic of Murray Valley encephalitis (MVE) led to the isolation of MVE virus from a pool of mosquitoes (Culex annulirostris) and a sentinel chicken from Charleville, south-west Queensland. A high proportion of domestic fowls at Charleville had antibody to MVE virus at the beginning of February 1974, in advance of the first case recognized in Queensland and allowing early warning from health authorities. A survey of antibody in domestic fowls in mid-1974 suggested widespread activity of MVE virus in western and east-central Queensland. Virus isolation and serological studies showed activity in south-west Queensland of three other viruses known to infect man, Ross River, Sindbis and Kunjin viruses.
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