Monitoring on contamination of external environment of live poultry markets by avianinfluenza virus and effect evaluation on closure of live poultry markets in Longgang District
LIU Feng-ren, LIANG Xiang-sheng, LI Gang, LIU Feng, YE Bi-li, LI Jing-mei
Center for Disease Control and Prevention of Longgang District, Shenzhen, Guangdong 518172, China
Abstract:Objective To evaluate the effects of different management measures on control of contamination of live poultry markets by avian influenza virus through environmental monitoring. Methods Sixteen live poultry markets from 8 streets in Longgang District were selected for environmental monitoring of influenza A and H5, H9, H7,H7N9 subtypes by RT-PCR assay before and after united closure of live poultry markets in Shenzhen City from December 2014 to February 2015. The incidence of people infected with H7N9 in Shenzhen was compared with that of other parts of Guangdong Province within 1 month after 10-days closure of live poultry markets. Results Totally, 215 environmental samples were detected. Influenza A and H9, H5,H7 subtypes were detected in 138, 37, 24 and 3 samples,with the positive rates of 64.19%, 17.21%, 11.16% and 1.40%, respectively. Only 1 specimen was detected to be positive for H7N9. The positive rates of influenza A and H5 subtypes were different for different types of external environment specimens(χ2=23.354, P=0.000; χ2=10.609, P=0.005, respectively). The constituent ratio of new cases in Shenzhen(6.67%) within 1 month after 10-day united closure of live poultry markets was significantly lower than that of other parts of Guangdong Province (46.55%) (χ2=8.018, P=0.005). The contamination rates of external environment of live poultry markets by influenza A and H9 subtypes were significantly decreased(χ2=48.337,P=0.000;χ2 =6.509,P=0.011). Strict implement of “zero live poultry in markets” could effectively reduce contamination of external environment of live poultry markets by influenza A virus (χ2=5.465,P=0.019). Conclusions Environmental contamination by avian influenza virus exists in Longgang District, and measures of “zero live poultry in markets” and unified closure of live poultry markets are scientific and effective for the prevention and control of H7N9 infection at the present stage.
刘凤仁, 梁享生, 李刚, 刘峰, 叶碧莉, 李静媚. 深圳市龙岗区活禽市场外环境流感病毒污染监测及休市措施效果评价[J]. 实用预防医学, 2016, 23(7): 804-807.
LIU Feng-ren, LIANG Xiang-sheng, LI Gang, LIU Feng, YE Bi-li, LI Jing-mei. Monitoring on contamination of external environment of live poultry markets by avianinfluenza virus and effect evaluation on closure of live poultry markets in Longgang District. , 2016, 23(7): 804-807.
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