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目的:分析常山县1例同病房密切接触者人感染H7N9禽流感病例的流行病学特征,追溯感染来源,为预防控制人感染H7N9禽流感疫情提供科学依据。方法:对病例、密切接触者和涉禽场所进行详细的流行病学调查,采用暴露风险矩阵分析感染来源,采集呼吸道标本和环境标本,采用RT-PCR方法检测H7N9病毒核酸。结果:病例徐某2015年2月24日发病,26日确诊为人感染H7N9禽流感病例,无明显禽类密切接触史,医院内病友间感染可能性大,患者3月2日救治无效死亡。经积极疫情处理,疫情得到有效控制,未出现后续病例。结论:病例徐某为一起医院内感染聚集性疫情续发病例,人传人可能性大;密切接触者及时调查为该起疫情早发现、早处置起到了关键性作用。
Objective: To analyze the epidemiological characteristics of H7N9 bird flu in one case of close contact with ward in Changshan County, and to trace the source of infection and provide a scientific basis for the prevention and control of the human infection of H7N9 bird flu. Methods: A detailed epidemiological investigation was conducted on cases, close contacts and wading places. Source of infection was analyzed by exposure matrix, respiratory tract specimens and environmental samples were collected. The H7N9 virus nucleic acid was detected by RT-PCR. Results: The case of Xu February 24, 2015 onset, 26 confirmed cases of human infection with H7N9 bird flu, no clear history of close contact with birds, the possibility of infection among patients in the hospital large, the patient died of treatment on March 2 dead. After the active epidemic situation was dealt with, the outbreak was effectively controlled and no follow-up cases occurred. Conclusions: Xu was a case of continuous accumulation of infectious disease in hospital, and the possibility of human transmission was high. Close investigation of the close contacts promptly detected and treated the epidemic early and played a key role.