推广应用甲肝疫苗后人群免疫水平动态观察

目的：了解推广应用甲肝疫勒后人群免疫水平的动态变化，为逐步使高危人群得到免疫覆盖，以提高人群免疫水平提供依据。方法：1998－2000年连续3年检测健康人群抗HAVIgG。结果：1998、1999年人群抗HAVIgG阳性率分别为74．24％、76．36％，至2000年时，人群抗HAVIgG阳性率为83．68％；2－4岁、6－8岁、13－15岁、20－29岁；30－39岁的抗HAVIgG阳性率分别达到74．02％、68．49％、79．41％、85．71％、90．80％。甲肝不同流行强度的三个地区，抗HAVIgG阳性率不同，尤以甲肝高发区的东台抗HAVIgG阳性率上升明显。东台肝炎监测点在使用疫苗后的1994年，1995年抗HAVIgG阳性率分别为45．17％和58．42％，而1998年抗HAVIgG阳性率达68．19％，1999年抗HAVIgG阳性率为75．16％，至2000年时，抗HAVIgG阳性率为85．71％。0－，10－，20－，30－，40－岁年龄组阳性率分别上升80．62％、76．62％、84．42％、86．67％、91．53％。结论：大规范推广接种甲肝疫苗后，能大量消除易感人群，提高整个人群的免疫水平。

DYNAMIC OBSERVATION OF THE CROWD IMMUNE STANDARD AFTER CARRYING OUT HEPATITIS A VACCINE

Objective:To acknowledge the dynamic changes of crowd immune level after carrying out hepatitis A vaccine and provide evidence for coveraging the high risk population and improve their immune level.Methods:The crowd's positive rate of anti HAVIgG was detected from 1998 to 2000.Results:The positiving rates of anti HAVIgG in three years were 74 24%?76 36% and 83 68%,respectively.While the epidemic intensity was different,the positive rate was different as well.The positive rate in Taidong area had obviously increased.Conclusion:Applications of hepatitis A may improve the immune level of total population.