Epidemiological investigation of an outbreak of viral Hepatitis A

Objective To explicit the cause of this HAV outbreak.Method Using case-control study method,according to the results beforehand,designed a unified questionnaire and carried out for children under 14-years-old,meanwhile collecting their serum to detect the anti-HAV IgM.All anti-HAV IgM positive children were case group,the children with anti-HAV IgM negative and HAV-IgG negative were control group.Constructed a database with EPIDATA software and analyzed by SPSS13.0.Results 20 children were infected this disease,the epidemic curve was double peak.Analysis showed the risk factors of this disease were that often played in the kindergarten,ate and played with first case.Conclusions The outbreak of this disease was typical continuity transmit in crowd,the sicken children were infected by toys and led the HAV dissemination.The children without good health habits were contribute to the disease,for examples eat without washing one's hands,drink unboiled water and so on.