【摘要】 [目的]分析重庆市2009年1～11月甲型H1N1流感的流行特征,预测发病趋势,为制定防控策略提供科学依据。[方法]对重庆市甲型H1N1流感病例进行描述性流行病学分析,监测哨点医院门诊流感样病例就诊比,监测哨点医院流感样病例、急性呼吸道感染病例的流感病毒谱和优势毒株,抽样调查重庆市人群甲型H1N1流感血清抗体水平,预测发病趋势。[结果]2009年6月13日,重庆市确认首例甲型H1N1流感疫情,截止2009年11月30日,累计报告甲型H1N1流感病例2179例,无死亡,发病率为7.74/10万。甲型H1N1流感在重庆的流行过程经历了输入个案病例、输入聚集性病例、病例本土化并出现多点聚集3个阶段,流行高峰为10月。病例分布于全市40个区县,主城区发病率高于远效县。男︰女=1.4︰1,报告发病以10～20岁组最多,职业以学生为主。400名人群甲型H1N1流感病毒血清抗体监测结果,阳性率为15.40%。[结论]2009年重庆市发生了流感流行,甲型H1N1流感已由输入转为本土,是导致流感流行的优势毒株。2009年重庆市流感的流行特征与往年不同;重庆市将继续出现甲型H1N1流感流行;发病者的年龄、职业、地域范围将更加广泛;症状很轻或无明显临床症状的感染者是引起疫情扩散蔓延的重要危险因素之一。更多还原

【Abstract】 [Objective] To analyse the epidemic of the A H1N1 flu in Chongqing from January to November 2009,and predict the morbidity tendency.These will be the science foundation for formulating the prevention and control strategies.[Methods] Used descriptive epidemiology analysis.Monitored the ILI cases in sentinel hospitals,and the visit ratio of ILI(influenza-like illness) cases in OPD(out-patient clinic).Monitored the spectra and dominate strains of influenza virus in ILI,ARI(acute respiratory infection) cases.Did sample investigates and tested the antibody level for aH1N1 in serum in Chongqing.[Results] The first A H1N1 patient was confirmed on June 13th 2009.Until November 30th,2 179 cases were reported accumulatively and 0 death case.The IR(incidence rate) was 7.74 in a hundred thousand.The epidemic process of aH1N1 flu in Chongqing experienced 3 stages:imported separate case,imported cluster,multipoint cluster and outbreak with domestic cases.The popular peak was in October.Patients were distributed in 40 districts /counties;IR in main city was higher than which in suburb.Male︰female=1.4︰1;the occupation of most cases was student,age group was 10-20yr.400 people were taken the test of H1N1 antibody in blood serum,and the positive rate was 15.4%.[Conclusion] There is a pandemic influenza in Chongqing,2009:the aH1N1 virus is the dominate strain and the route of infection changes into domestic from importing.The epidemic characteristic of flu in Chongqing 2009 is different from the former years.The pandemic of aH1N1 will continue in Chongqing,the rage of patients’ age,occupation and region will be more widespread.Patients have light or no clinical symptoms will be one of the most important risk factors,which can cause the diffusion and extension of disease.更多还原