Li Ya-pin, Qian Quan, Fang Li-qun, Yang Hong, Wei Mao-ti, Gao Yan, Yang Hua, Zhang Yong, Cao Wu-chun
State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Science Institute of Microbiology and Epidemiology, Beijing 100071, China.
Zhonghua Liu Xing Bing Xue Za Zhi. 2009 Nov;30(11):1102-5.
To describe the epidemical characteristics of A (H1N1) influenza identified in the early stage (from May 11 to June 22, 2009) of the epidemic, in mainland China.
Epidemical characteristics of 420 confirmed A (H1N1) influenza cases reported from May 11 to June 22, 2009 were analyzed descriptively, including the distribution of age, sex, source of infection, main symptoms and incubation period.
A total of 77.8% early cases in mainland China were imported from other countries. Three countries including America, Canada and Australia were attributed to 90% of the imported cases. Most of the cases were from 6 months to 73 years old, with 94% of them under 50 years. Most of the symptoms would include fever (81%), cough (40%) and sore throat (35%). The mean incubation period of second-generation cases was 4.3 (4.2 +/- 1.5) days.
Imported cases dominated the total cases in the early stage of the epidemic had similar gender distribution of those from exporting countries. Fever, cough and sore throat were the three main symptoms manifested in influenza cases. 2.5 +/- 1.9 (1 - 11) days was found in imported cases between the day of off-board and the onset of symptoms. The incubation period was 4.3 +/- 1.7 (1 - 8) days among the secondary cases.
描述中国大陆甲型H1N1流感疫情早期（2009年5月11日至6月22日）的流行特征。
对2009年5月11日至6月22日报告的420例甲型H1N1流感确诊病例的流行特征进行描述性分析，包括年龄、性别、感染源、主要症状和潜伏期分布。
中国大陆早期病例中77.8%为输入性病例，输入性病例的90%来自美国、加拿大和澳大利亚3个国家。病例年龄多在6个月至73岁之间，94%的病例年龄在50岁以下。多数病例症状包括发热（81%）、咳嗽（40%）和咽痛（35%）。二代病例的平均潜伏期为4.3（4.2±1.5）天。
疫情早期输入性病例占总病例数的主导，其性别分布与输出国相似。发热、咳嗽和咽痛是流感病例的三大主要症状。输入性病例从下飞机到发病的时间为2.5±1.9（1 - 11）天，二代病例的潜伏期为4.3±1.7（1 - 8）天。
