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目的:调查宜昌市流感活动状况及流行动态变化规律和每年的流行株及其构成。方法:在哨点医院和流感爆发疫情事件中,采用流行病学监测和实验室检测方法进行调查。结果:宜昌市4月份与7月份为流感样病例人数高峰。两起流感爆发流行主要集中在中小学,全部由B型流感病毒引起。在调查和监测中分离的流感病毒以B型及H1型为主,宜昌市健康人群流感病毒的抗体阳性率为56%。结论:宜昌市流感高峰在4月份与7月份,流行的病毒株以B型及H1型为主,健康人群免疫水平不高。
Objective: To investigate the status of influenza activity and epidemic dynamics in Yichang City and the epidemic strains and its composition. METHODS: Epidemiological and laboratory tests were conducted in sentinel hospitals and outbreaks of influenza. Results: Yichang City in April and July as the peak number of flu-like cases. The two flu outbreaks are mainly concentrated in primary and secondary schools, all caused by influenza B virus. Influenza virus isolated in the survey and monitoring was mainly type B and H1, and the positive rate of influenza virus in healthy population in Yichang was 56%. Conclusion: The peak influenza in Yichang City in April and July, the prevalence of the virus strains to type B and H1-based, healthy people immune level is not high.