MURRAY VALLEY ENCEPHALITIS IN EASTERN AUSTRALIA, 1971

Two young children with encephalitis at Charleville and Aibury in February‐March, 1971, showed serological evidence of infection with Murray Valley encephalitis virus or a closely‐related agent. Serological surveys of domestic fowls showed Group B arboviruses of the Murray Valley encephalitis virus subgroup to have been active at Charleville and in Victoria near the Murray River. The findings are compatible with the hypothesis that Murray Valley encephalitis virus spread widely and caused disease in man in south‐east Australia in 1971, for the first time since 1956. The pattern of high spring rainfall, detected in northern Australia and the Darling River watershed before the four major epidemics of Murray Valley encephalitis in 1917, 1918, 1925 and 1951 and suggested as an index of epidemic risk, was not present in 1970.

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