摘要
目的探讨2012年成都市流感流行特征,为制定流感防制策略提供科学依据。方法对2012年成都市流感监测的流感样病例(ILI)资料、病毒分离鉴定结果、暴发疫情信息、报告病例进行分析。结果哨点医院报告ILI%为0.61%,全年无明显高峰,1～3月和8～9月相对较高;占ILI比例最高的为25～59岁年龄组(37.53%),最低的为60岁～年龄组(6.63%);全年无暴发疫情;共采集标本1 942份,对444份进行了流感病毒核酸检测,核酸阳性121份,阳性率27.25%,对1 924份标本进行了病毒分离,分离到流感病毒234株,分离率12.16%,B型、新甲型H1N1、A(H3N2)亚型分别占阳性毒株的71.79%、1.71%、26.50%。各年龄组分离率分别为5.43%、21.03%、12.83%、12.48%和8.79%;主要流行毒株为B型流感病毒,1～3月优势毒株为B型流感病毒,4～9月优势毒株为A(H3N2)亚型,未分离到A(H1N1)亚型流感病毒毒株;共报告流感病例344例,分别在2-3月和7月形成2个高峰。结论 B型为优势毒株,与A(H3N2)亚型交替流行;全年呈现双峰流行;25～59岁年龄组可能是受流感侵袭的主要人群。
Objective To investigate the epidemiological characteristics of influenza in 2012 in Chengdu city, and to provide scientific basis for the prevention and control of influenza. Methods Monitoring data of influenza patients, results of virus isolation and identification, outbreak incidences and reported eases were collected and analyzed. Results Sentinel hospitals reported ILI% was 0. 61% ,with no apparent peak through the year,yet the rates in January to March and August to September were relatively high. The highest proportion of ILI was 25 -59 yearage group （37. 53% ） ,and the lowest was≥60 - year - age group （6. 63% ）. A total of 1 942 specimens were collected,and 444 samples of influenza virus were conducted nucleic acid detection,with 121 positive （27.25%）. Totally 1 924 specimens were isolated and 234 influenza virus strains were confirmed （12. 16% ）. Type B, H1N1 and A（H3N2） subtype accounted for 71.79%, 1.71% and 26. 50% of the positive strains,respectively. As for each age group,the separation rates were respectively 5.43% ,21.03%, 12. 83%, 12. 48% and 8.79%. The main epidemic strains was influenza B virus,with influenza B virus for January to March and A （H3N2） for April to September;no A （H1 N1 ） subtypes were separated. The total reported number of flu cases was 344, peaking in February to March and July. Conclusion B type is the domi- nant strain,with A（H3N2） as alternate subtype;the prevalence rate show double peaks through the year;people aged 25 - 59 year may be the main vulnerable population.
出处
《职业卫生与病伤》
2013年第2期93-95,共3页
Occupational Health and Damage
关键词
流感
监测
流行率
influenza
surveillance
prevalence rate
