A survey of antibodies to Group A and Group B arbovinlws (also designated as a1pbaviruses and f1aviviruses respectively) was perfonned in residents of a Murray Valley town eight months after an outbreak of arbovirus illnesses in other parts of the region. 'The sampling pattern was based upon a random selection of households. 'The prevalence of Group A antibodies rose steadily with relation to age. 'The prevalence of Group B antI'bodies was much lower in all age groups, and did not show such a consistent rise with age. No Group B antibodies were found in yOlDlger residents. 1bis suggests either an unexpectedly rapid decay of the particular type of antibody in this age group, or regional variations in the prevalence of arbovirus which are not currently understood. Some individuals appear to be unusually exposed to arbovirus infection.
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