| [the relationship between changing of anti-hav in population and prevalence of hepatitis a]. | hepatitis a was prevalent in 43 villages of the suburbs of jinan, shandong province in 1986. the annual morbidity rate was 1,104.46/100,000. the authors studied the development of anti-hav among children of under 14 years of age during the early epidemic and post-epidemic periods, compared the prevalence of anti-hav between epidemic and non-epidemic villages, and analysed the types of hav infection. the positive rate of anti-hav was 35.42% during the early epidemic period and was 82.1% during th ... | 1989 | 2555117 |