We conducted environmental surveillance to detect avian influenza viruses circulating at live poultry markets(LPMs)and poultry farms in Guangxi Autonomous Region,China,where near the China-Vietnam border.From November...We conducted environmental surveillance to detect avian influenza viruses circulating at live poultry markets(LPMs)and poultry farms in Guangxi Autonomous Region,China,where near the China-Vietnam border.From November through April 2017-2018 and 2018-2019,we collected environmental samples from 14 LPMs,4 poultry farms,and 5 households with backyard poultry in two counties of Guangxi and tested for avian influenza A,H5,H7,and H9 by real-time reverse transcription-polymerase chain reaction(rRT-PCR).In addition,we conducted four cross-sectional questionnaire surveys among stall owners on biosecurity practices in LPMs of two study sites.Among 16,713 environmental specimens collected and tested,the median weekly positive rate for avian influenza A was 53.6%(range=33.5%-66.0%),including 25.2%for H9,4.9%for H5,and 21.2%for other avian influenza viruses A subtypes,whereas a total of two H7 positive samples were detected.Among the 189 LPM stalls investigated,most stall owners(73.0%)sold chickens and ducks.Therefore,continued surveillance of the avian influenza virus is necessary for detecting and responding to emerging trends in avian influenza virus epidemiology.展开更多
基金Cooperative Agreements between China CDC and US CDC.(5 NU51IP000864,5 U01IP001106).
文摘We conducted environmental surveillance to detect avian influenza viruses circulating at live poultry markets(LPMs)and poultry farms in Guangxi Autonomous Region,China,where near the China-Vietnam border.From November through April 2017-2018 and 2018-2019,we collected environmental samples from 14 LPMs,4 poultry farms,and 5 households with backyard poultry in two counties of Guangxi and tested for avian influenza A,H5,H7,and H9 by real-time reverse transcription-polymerase chain reaction(rRT-PCR).In addition,we conducted four cross-sectional questionnaire surveys among stall owners on biosecurity practices in LPMs of two study sites.Among 16,713 environmental specimens collected and tested,the median weekly positive rate for avian influenza A was 53.6%(range=33.5%-66.0%),including 25.2%for H9,4.9%for H5,and 21.2%for other avian influenza viruses A subtypes,whereas a total of two H7 positive samples were detected.Among the 189 LPM stalls investigated,most stall owners(73.0%)sold chickens and ducks.Therefore,continued surveillance of the avian influenza virus is necessary for detecting and responding to emerging trends in avian influenza virus epidemiology.
