Surveillance and Epidemiological Investigation on Viral Hepatitis in Shanghai

Having strengthened the epidemiological surveillance and comprehensive measures for prevention and control, the incidence of acute viral hepatitis decreased markedly since the outbreak of Hepatitis A(HA) in Shanghai 1998.In 1997 the incidence of acute hepatitis,which was 46.78% lower than that in 1990,was 90.08 cases per 100,000 population.So it could not formed the periodical prevalent year. HA was the primary type in all kinds of hepatitis and its seasonal distribution was in spring in Shanghai. Most of the cases of HA concentrated in young people.The incidence of Hepatitis B(HB) decreased steadily.And the incidence of Hepatitis E(HE) increased gradually in recent years and the range of infection tended to the older people.Having investigated epidemiological factor,we found that the infection of HA and HE related to picnic dining together and travelling in prevalent season,the OR value was 7.34,5.32,2.84 respectively.The result provided a base on prevention and control for HA and HE.