四川省2009甲型H1N1流感的流行病学特征

目的分析四川地区甲型H1N1流感流行病学特点,为今后新发传染病的防控提供参考。方法回顾性分析我院2009年收治的271例甲型H1N1流感病例的来源、年龄及时间分布。结果 1.271例甲型H1N1流感病例,男∶女为1.09∶1,随着病情加重发病年龄逐渐增加,病程亦逐渐延长;2.轻症患者均无基础疾病,危重症患者基础疾病较重症患者多且重;3.绝大多数患者年龄在10~30岁（211例,77.87%）,轻症及重症中无≤2岁及≥65岁的患者,危重症中≥65岁者2例;4.疫情早期（5~9月）患者均为轻症,以输入病例为主（52例,19.19%）,疫情后期以本土暴发病例为主（9月以后）有危重症出现。结论新发传染病疫情早期以轻症、输入病例为主,后期随着社区聚集性疫情,有重危症患者出现;患者年龄、基础疾病是该疾病严重程度的重要影响因素。

Epidemiological characteristics of influenza A pandemic(H1N1) 2009 in Sichuan

Objective To analyze epidemiological characteristics of influenza A（H1NI） cases confirmed in Sichuan.Analysis of influenza H1N1 in Sichuan epidemiological features of influenza,and provide reference for future controlling epidemic of new and outbreak infectious diseases.Methods Retrospective analysis of hospital admitted 271 cases in 2009 Influenza A（H1N1） influenza cases the source,age and time distribution.Results 1） There were 271 Influenza A（H1N1） cases.The proportion of male ∶ female was 1.09 ∶ 1.Patients condition was more and more serious with the age increasing and the duration extending.2） Mild cases had no basal disease,while severe and critical patients had one or more basal disease,especially critical patients had multiple and heavy severe basal disease.3） Most of the patients aged 10 to 30 years（211 cases,77.87%）.There was no younger than 2 and older than 65 years old in mild and severe patients.2 cases of critical patients was older than 65 years old.4） In early period of infectious diseases epidemic（May to September） patients condition were mild.In later period of infectious diseases epidemic（post September） severe or critical patients appeared compared with local outbreaks.5） In early period of infectious diseases epidemic all of cases were input（52 cases,19.19%）,in later period of infectious diseases epidemic majority cases were local outbreaks.Conclusions In early period of epidemic of new and outbreak infectious diseases cases is input,mild,while in later period of infectious diseases epidemic majority cases were local outbreaks,severe or critical patients appeared compared with local epidemic outbreaks.Age and basal disease were important factors for patients condition.