Abstract：Objective To analyze the epidemiological features of an outbreak of H3 influenza in a primary school in Futian District of Shenzhen City, to explore its risk factors and transmission route so as to provide a basis for prevention and control of H3 influenza in the school. Methods Descriptive method was used to analyze the epidemiological features of the cases. Case-control study and two-classification Logistic regression analysis were employed for analyzing the related risk factors of the outbreak. Results A total of 46 cases were searched, with the attack rate of 4.3% (46/1,072). The main clinical symptoms were fever (100.0%), cough (65.2%) and sore throat (34.8%). The average age of the patients was 7 years old, and they were distributed in two classes, of which the attack rate in the First Class of Grade Two reached up to 62.8%. In the First Class of Grade Two, the number of the cases accounted for 79.00% of the students who took a nap after lunch at school. Single factor analysis of the risk factors related to the cases and the non-cases in the two classes revealed that there were statistically significant differences in hand washing before meals (χ2=4.910,P=0.027), hand washing after going to the toilet (χ2=5.764,P=0.016), soap or hand washing liquid consumption (χ2=4.071,P=0.044), physical exercise (Z=-2.817,P=0.005) and extracurricular training (χ2=5.635,P=0. 018). Conclusions The incident is an outbreak induced by H3 influenza virus, and contact in group activities or infectious droplet may be the causes of the spread of influenza virus. The related risk factors for the students are poor health habits for hand washing, delayed or insufficient isolation, unreasonable arrangement of school beds, participating in extracurricular training classes and so on.
许舒乐, 马起山, 钟剑明, 许玉成, 司徒潮满. 深圳市福田区某小学一起H3型流感暴发调查及相关因素分析[J]. 实用预防医学, 2017, 24(9): 1079-1083.
XU Shu-le, MA Qi-shan, ZHONG Jian-ming, XU Yu-cheng, SITU Chao-man. An outbreak of H3 influenza and its related factors in a primary school in Futian District, Shenzhen City. , 2017, 24(9): 1079-1083.
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2017, Vol. 24 
