周蕾, 任瑞琦, 张彦平, 倪大新, 李群. 2014年9-12月中国内地人感染H7N9禽流感疫情流行病学特征分析[J]. 疾病监测, 2015, 30(4): 265-268. DOI: 10.3784/j.issn.1003-9961.2015.04.005
引用本文: 周蕾, 任瑞琦, 张彦平, 倪大新, 李群. 2014年9-12月中国内地人感染H7N9禽流感疫情流行病学特征分析[J]. 疾病监测, 2015, 30(4): 265-268. DOI: 10.3784/j.issn.1003-9961.2015.04.005
ZHOU Lei, REN Rui-qi, ZHANG Yan-ping, NI Da-xin, LI Qun. Epidemiology of human infection with avian influenza A(H7N9) virus in China, September-December,2014[J]. Disease Surveillance, 2015, 30(4): 265-268. DOI: 10.3784/j.issn.1003-9961.2015.04.005
Citation: ZHOU Lei, REN Rui-qi, ZHANG Yan-ping, NI Da-xin, LI Qun. Epidemiology of human infection with avian influenza A(H7N9) virus in China, September-December,2014[J]. Disease Surveillance, 2015, 30(4): 265-268. DOI: 10.3784/j.issn.1003-9961.2015.04.005

2014年9-12月中国内地人感染H7N9禽流感疫情流行病学特征分析

Epidemiology of human infection with avian influenza A(H7N9) virus in China, September-December,2014

  • 摘要: 目的 分析中国大陆地区2014年9-12月人感染H7N9禽流感疫情情况,为防控策略的制定和调整提供科学依据. 方法 以我国报告的确诊H7N9禽流感病例为研究对象,用描述性流行病学方法分析病例的时间、空间和人群分布特点. 结果 2014年9-12月,我国共确诊人感染H7N9禽流感病例31例,死亡9例,病例数较上年同期增长2.1倍.病例分布在7个省(直辖市),其中13例发生在既往有疫情的县(区),18例发生在新发县(区).病例的年龄中位数为54岁(7~83岁),男性占48%(15/31).93.5%的病例在发病前有禽类相关暴露史. 结论 近期中国内地人感染H7N9禽流感疫情较去年同期明显增长,部分省份出现地域聚集性,多数病例在发病前有活禽或活禽市场暴露史.近期疫情仍会呈现散发态势,仍会继续出现新发病例和新发省份或地区,减少禽类或活禽市场暴露仍是防控重点.

     

    Abstract: Objective To understand the epidemiological characteristics of human infection with avian influenza A(H7N9) virus in the mainland of China during September-December,2014,and provide scientific evidence for the improvement of preventive strategy and control measures. Methods The information of demographic characteristics and epidemiological histories of the human H7N9 virus infection cases were collected through from field epidemiological investigation and communicable disease reporting system. Results A total of 31 cases were reported during this period, including 9 deaths, an increase of 2.1 times over the same period in 2013. The 31 cases were distributed in 7 provinces, in which 13 occurred in previous epidemic areas and 18 occurred in new epidemic areas. The median age of the confirmed cases was 54 years(range 7-83 years), and the male cases accounted for 48%(15/31). Up to 93.5% of the cases had exposure to live poultry or contaminated environments. Conclusion The incidence of human infection with avian influenza A(H7N9) in the Mainland of China showed an obvious increase during September-December 2014 compared with the same period in 2013 and cases clustering were observed in some areas. Most cases had live poultry or poultry market exposure histories before illness onset. New sporadic cases and new affected area would continue to appear in this influenza season. Reducing the exposure to poultry or live poultry market is essential in the prevention of human infection with H7N9 virus.

     

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