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目的观察天水市流行性感冒(流感)流行状况及流感病毒类型,分析流行趋势,为流感预防控制提供依据。方法2005年11月～2008年10月,采集流感监测点医院和辖区内流感样病例爆发疫情典型病例咽拭子标本,送甘肃省疾病预防控制中心(CDC),采用鸡胚和狗肾传代细胞分离流感病毒,并用血凝和血凝抑制试验对病毒进行鉴定,分离的毒株送中国CDC病毒病预防控制所国家流感中心进行复核鉴定。结果共采集流感样病例咽拭子标本1819份,分离出流感病毒247株,分离率为13.58%。其中甲1型36株,占14.57%;甲3型75株,占30.36%;乙型136株,占55.06%[维多利亚(Victoria)系121株、山形(Yamagata)系15株]。结论天水市存在甲1型、甲3型和乙型流感病毒活动,在不同年度以不同强度同时或交替活动,爆发疫情均发生在农村中小学校,以乙型为主。
Objective To observe the prevalence of influenza (influenza) and the type of influenza virus in Tianshui City and analyze the epidemic trend, and provide evidence for the prevention and control of influenza. Methods From November 2005 to October 2008, throat swabs from typical outbreaks of influenza-like illness were collected from hospitals and districts of flu surveillance center and sent to CDC of Gansu Province. Chick embryos and canine kidney passage cells The influenza virus was isolated and identified by the hemagglutination and hemagglutination inhibition tests. The isolated strains were submitted to the National Influenza Center of China CDC Virus Disease Prevention and Control for review and identification. Results A total of 1819 samples of influenza-like throat swabs were collected, and 247 influenza virus isolates were isolated with a separation rate of 13.58%. Among them, 36 strains were type A and 36, accounting for 14.57%; 75 strains were type A and 30, accounting for 30.36%; 136 strains were type B, accounting for 55.06% [Victoria 121 and Yamagata 15]. Conclusions There was a type A, type A and type B influenza virus activity in Tianshui city, with different intensity at the same or alternate activities in different years. All the outbreaks occurred in primary and secondary schools in rural areas.