Analysis of epidemiological characteristics of viral hepatitis A in Wuchuan County of Guizhou Province from 2000 to 2005

Objective The study was conducted to explore the epidemiological characteristics of viral hepatitis A and to provide the scientific basis for preventive approaches.Methods Descriptive epidemiological analysis was conducted to compare the epidemiological characteristics before and after the vaccination of hepatitis A among people.Results Before the vaccination of hepatitis A,its incidence was increasing year after year with the peak in 4-8 months,and the major affected were students and secondly farmers,the major age ranging from 5 to 9.After the vaccination,the incidence rate of hepatitis A dropped largely by year and the proportion of older age group increased.Seasonal incidence concentration decreased while no significant seasonal incidence and no difference between each age group were observed.The major affected were still farmers and students.Conclusion Hepatitis A vaccination can significantly reduce the incidence of hepatitis A and protect people from the disease.