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目的了解2007年无锡地区流感流行的特点,探讨流感优势株的变化,进一步加强监测工作,为做好流感预防控制工作提供科学依据。方法对采集的流感病例标本用MDCK细胞、0.75%的人“O”型红细胞作微量血凝试验(HA),血凝抑制试验(HI)进行流感病毒培养、分离、鉴定。结果2007年度共做流感样病例标本650份,分离出流感病毒122株,平均分离率为18.77%。最高月份为42.11%,分离的病毒型别为甲1型3株,时空分布在冬春季;甲3型55株,冬春季和夏季各占1/2;B型Victoria系6株,分布在冬春季;B型Yamagata系58株,主要分布在夏季。结论甲(H3N2)亚型和B型Yamagata系为无锡市2007年流行优势株,需加强防范该毒株引起的暴发流行。
Objective To understand the characteristics of the influenza epidemic in Wuxi in 2007, to explore the changes of the dominant strains of influenza, to further strengthen the monitoring work and to provide a scientific basis for the prevention and control of influenza. Methods The collected influenza samples were collected and identified by using MDCK cells and 0.75% human erythrocytes as micro-hemagglutination test (HA) and hemagglutination inhibition test (HI). Results A total of 650 specimens of influenza-like illness were collected in 2007, of which 122 strains were isolated. The average isolation rate was 18.77%. The highest month was 42.11%, the type of virus isolated was 3 strains of type A and type 1 with spatiotemporal distribution in winter and spring, 55 strains of type A and 3 in winter, spring and summer respectively, and 6 strains of type B Victoria were distributed in winter Spring; B-type Yamagata 58 strains, mainly in the summer. Conclusion A (H3N2) subtype and Yamagata B strain are predominant strains in Wuxi City in 2007, so it is necessary to guard against the outbreak of this strain.