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目的分析2011—2013年定西市流感监测结果,了解定西市流感流行特征及其优势毒株变化,为流感防治工作提供科学依据。方法收集2011年第1周至2013年第52周定西市流感监测哨点医院的流感流行病学和病原学数据并进行描述性分析。结果定西市2011—2013年3个监测年度流感样病例就诊百分比差异有显著性(P<0.001),其曲线在春季与冬季出现高峰。流感样病例就诊百分比在各年龄组差异有显著性,以0~4岁组最高,为2.89%。3个监测年度分离出的优势毒株不同,前两年为B型,第三年为新甲H1,分离出的阳性率有显著性差异(P<0.001)。结论 2011—2013年定西市流感流行较为平稳,具有明显的季节性,流感优势毒株不断发生变化。
Objective To analyze the influenza surveillance results of Dingxi City from 2011 to 2013, understand the epidemic characteristics of influenza in Dingxi City and the changes of its dominant strains, and provide a scientific basis for the prevention and control of influenza. Methods The epidemiological and etiological data of influenza in the sentinel surveillance hospital of Dingxi City during the first week of 2011 to the 52nd week of 2013 were collected and analyzed descriptively. Results There was a significant difference (P <0.001) in the percentage of influenza-like cases between 2011 and 2013 in Dingxi City. The curve peaked in spring and winter. Influenza-like cases showed a significant difference in the percentage of visits among all age groups, with a highest rate of 2.89% in the 0-4 age group. The dominant strains isolated in the three monitoring years were different. The first two years were Type B and the third year was Xinyao H1. There was a significant difference (P <0.001) in the positive rates of isolation. Conclusion The prevalence of influenza in Dingxi City during 2011-2013 was relatively stable with obvious seasonal variations. Influenza strains were continuously changing.