Abstract
An epidemic of infectious hepatitis occurred in Curwensville, Clearfield County, Pennsylvania, in March 1956. One hundred twenty-nine cases occurred in Curwensville and an additional forty in the surrounding School Jointure during a thirty-nine-day period. Investigation revealed time, age and geographic characteristics which suggest common source rather than contact transmission. The peculiarities of the municipal water supply fit the epidemiologic data to make this the probable vehicle.
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