[A population-based study on types of viral hepatitis]

The epidemiological features of various types of acute viral hepatitis in 5 regions of Sichuan Province (211,639 population) from Feb. 16, 1987 to Feb. 15, 1988 were studied. The results of the study showed that the incidence of acute viral hepatitis was 167.74 per 100,000 and the proportion of HA, HB, NANBH, HEB, HCM, MIXED infection in all the patients was 24.51%, 38.31%, 24.51%, 3.38%, 3.38%, and 5.92 respectively. There was an incidence of 14.93% for multiple infections. Large incidence differences in these regions (from 110.30 per 100,000 to 299.95 per 100,000) were noted. The sex ratio (male: female) for acute viral hepatitis was 1.75:1. There was a peak attack rate of HA in 0-19 age group. The incidence of HB in 20-39 age group was obviously higher than those in other age groups. For NANBH, attack rate was relatively high in 5-19 age groups. There were no significant age-differences for HEB, HCM and mixed infections.