Zhou Lei, Ren Ruiqi, Yang Lei, Bao Changjun, Wu Jiabing, Wang Dayan, Li Chao, Xiang Nijuan, Wang Yali, Li Dan, Sui Haitian, Shu Yuelong, Feng Zijian, Li Qun, Ni Daxin
Public Health Emergency Center, Chinese Center for Disease Control and Prevention, Beijing, China.
Chengdu Prefecture Center for Disease Control and Prevention, Sichuan, China.
Western Pac Surveill Response J. 2017 Jan 18;8(1):6-14. doi: 10.5365/WPSAR.2017.8.1.001. eCollection 2017 Jan-Mar.
Since the first outbreak of avian influenza A(H7N9) virus in humans was identified in 2013, there have been five seasonal epidemics observed in China. An earlier start and a steep increase in the number of humans infected with H7N9 virus was observed between September and December 2016, raising great public concern in domestic and international societies. The epidemiological characteristics of the recently reported confirmed H7N9 cases were analysed. The results suggested that although more cases were reported recently, most cases in the fifth epidemic were still highly sporadically distributed without any epidemiology links; the main characteristics remained unchanged and the genetic characteristics of virus strains that were isolated in this epidemic remained similar to earlier epidemics. Interventions included live poultry market closures in several cities that reported more H7N9 cases recently.
自2013年首次发现甲型H7N9禽流感病毒感染人类以来，中国已出现过五次季节性疫情。2016年9月至12月期间，H7N9病毒感染人类的情况出现了更早的开始和数量的急剧增加，引起了国内外社会的极大公众关注。对最近报告的确诊H7N9病例的流行病学特征进行了分析。结果表明，尽管最近报告的病例较多，但第五次疫情中的大多数病例仍呈高度散发性分布，没有任何流行病学关联；主要特征保持不变，本次疫情中分离出的病毒株的基因特征与早期疫情相似。干预措施包括在最近报告更多H7N9病例的几个城市关闭活禽市场。
