Infectious hepatitis in Clearfield County, Pennsylvania. I. A probable water-borne epidemic.
D058872:Epidemics; D006505:Hepatitis; D006506:Hepatitis A / Q000453:epidemiology*; D006801:Humans; D010414:Pennsylvania; D011336:Probability; D014876:Water Pollution
HEPATITIS, INFECTIOUS/epidemiology; WATER POLLUTION