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目的了解新会区居民对甲型H1N1流感的免疫水平。方法采用多阶段分层随机抽样方法,三次分别在新会区的城镇和农村对不同年龄人群进行问卷调查并采集血清检测甲型H1N1流感病毒抗体。结果三轮调查共抽样480人,抗体阳性107人,阳性率为22.29%。不同年龄组中4~6和7~19岁阳性率分别为30.00%和31.77%,高于其他年龄组(χ2=26.75,P<0.05)。疫苗接种组抗体阳性率高于未接种疫苗组。有症状和无症状者的抗体阳性分别为25.72%和18.83%,差异无统计学意义(χ2=3.47,P>0.05),抗体阳性者中42.06%没有出现过任何流感症状。结论新会区已经有22.29%人群具有甲型H1N1流感病毒抗体,人群中已经建立一定的免疫屏障。
Objective To understand the immunization of residents in Xinhui District of Influenza A (H1N1). Methods A multistage stratified random sampling method was used to survey the population of different ages in the urban and rural areas of Xinhui District three times and collect the serum samples to detect the influenza A (H1N1) virus. Results A total of 480 patients were sampled in the three rounds of surveys, with 107 positives, the positive rate was 22.29%. The positive rates of 4 ~ 6 and 7 ~ 19 years old in different age groups were 30.00% and 31.77% respectively, higher than other age groups (χ2 = 26.75, P <0.05). The positive rate of antibody in vaccination group was higher than that in non-vaccinated group. The positive rates of antibodies in asymptomatic and asymptomatic subjects were 25.72% and 18.83%, respectively, with no significant difference (χ2 = 3.47, P> 0.05). No any flu symptoms were found in 42.06% of the antibody positive subjects. Conclusion 22.29% of the population has the influenza A (H1N1) virus antibody in Xinhui District, and a certain immune barrier has been established in the population.