Epidemiology of viral hepatitis in California, 1950-1970.

Epidemiologic patterns of type A (infectious) and type B (serum) hepatitis in California from 1950 to 1970 are presented. During this period hepatitis incidence increased greatly among teenagers and young adults but no significant increase occurred in other age groups. Much of this age-specific increase is related to the increasing drug abuse problem during the last decade. Other factors which possibly contribute to the current pattern of hepatitis in California are the overcrowding and inadequate sanitary facilities among a portion of young people between the ages of 15 and 30. Until these factors change or effective vaccines are developed, viral hepatitis will continue to be a significant public health problem.