[A case-control study on the transmission factor of hepatitis A outbreak of Wenzhou in 1988]

This investigation described a pair-matched case-control study on transmission factors of hepatitis A outbreak in Wenzhou City in earlier 1988. The results during early stage of the epidemic showed that, for the people having had meal in eating houses OR was 9.08, whereas for those having eaten clams OR was 3.63. The results during middle and later stages showed that, for the contactor of hepatitis A patients OR was 5.02, while for those having eaten clams OR was 4.29. The result of this investigation showed that this outbreak was related to eating in eating houses during the early stage of the epidemic, but related to both contact with HA patients and eating clams during middle and later stages of the epidemic.