Epidemic situation of human infection with avian influenzaA H7N9 virus and its related factors in Taizhou city
DONG Shi-hua1, JI Wei-guo2, GUAN Guo-mei2
1.Hailing District Office for Preventive Healthcare, Taizhou, Jiangsu 225300, China; 2.Gaogang District Center for Disease Control and Prevention, Taizhou, Jiangsu 225321, China
Abstract：Objective To investigate the epidemiological characteristics of human infection with avian influenza A H7N9 virus in Taizhou city in 2015-2018, and to provide a basis for its prevention and control in future. Methods Based on the cases ofhuman infection withavian influenza A H7N9 virusand the monitoring data of poultry and environment in Taizhou city from 2015 to 2018, the relationship between the epidemic situation of avian influenza and the distribution of poultry and environment viruses was analyzed. Results A total of 18 cases ofhuman infection withavian influenza A H7N9 virus were reported in Taizhou city during 2015-2018, and the onset dates were from December 2016 to March 2017. Out of the 1,488 poultry and environment samples, 120 were found to be positive for avian influenza virus, and H7N9 virus nucleic acid was detected in 32 samples. The epidemics spread from south to north and showed a tendency from densely populated areas to surrounding areas. No statistically significant difference was observed in the correlation between the number of the cases and the positive rate of H7N9 virus in the monitoring samples collected from poultry and environment (r=0.738, P>0.05). The pharyngeal swabs of all cases showed positive in H7N9 avian influenza virus nucleic acid test. H7N9 avian influenza virus nucleic acid was detected in the environmental samples collected from live poultry markets where the cases were exposed to, but was not detected in 121 close contacts. Conclusions Human infections with avian influenza A (H7N9) virus occur highly in winter and spring, and the outbreaks are more likely to occur in areas with positive H7N9 avian influenza virus nucleic acid detection in poultry and environment monitoring. Live poultry trading may be the main way to spread the epidemic. The epidemic situation is consistent with the trends from poultry and environment monitoring results.
董世华 , 季伟国 , 管国美. 泰州市人感染H7N9禽流感疫情及相关因素分析[J]. 实用预防医学, 2020, 27(2): 142-144.
DONG Shi-hua, JI Wei-guo, GUAN Guo-mei. Epidemic situation of human infection with avian influenzaA H7N9 virus and its related factors in Taizhou city. , 2020, 27(2): 142-144.
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2020, Vol. 27 
