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Volume 20, Number 11—November 2014

Human Influenza A(H7N9) Virus Infection Associated with Poultry Farm, Northeastern China

Ming Fan, Biao Huang, Ao Wang, Liquan Deng, Donglin Wu, Xinrong Lu, Qinglong Zhao, Shuang Xu, Fiona Havers, Yanhui Wang, Jing Wu, Yuan Yin, Bingxin Sun, Jianyi Yao, and Nijuan XiangComments to Author 
Author affiliations: Jilin Provincial Center for Disease Control and Prevention, Jilin, China (M. Fan, B. Huang, A. Wang, L. Deng, D. Wu, X. Lu, Q. Zhao, S. Xu); Changchun Prefectural Center for Disease Control and Prevention, Jilin (Y. Wang, J. Wu, Y. Yin, B. Sun); Chinese Center for Disease Control and Prevention, Beijing, China (J. Yao, N. Xiang); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (F. Havers)

Main Article


Specimen collection and results of real-time reverse transcription PCR testing for epidemiologic investigation into source of human influenza A(H7N9) virus infection, Jilin Province, China

Source and specimen type* Total no. specimens No. (%) positive results†
H7N9 and H9 H7N9 only H9 only
Case-patient poultry farm
Poultry feces 25 1 (4) 0 0
Sewage 8 3 (38) 0 0
Environmental swab samples (chicken troughs) 13 7 (54) 0 0
Oropharyngeal samples 20 7 (35) 1 (5) 3 (15)
Cloacal samples 17 0 0 0
Cloacal and oropharyngeal samples
1 (100)
Environmental samples from distributors’ farms and transport vehicles‡
4 (31)
Source farms and other area farms§
Poultry feces 148 0 0 0
Sewage 32 0 0 0
Environmental swab samples (chicken troughs) 150 0 0 0
Oropharyngeal samples 12 0 0 0
Cloacal samples 19 0 0 0

*One oropharyngeal swab sample from a goose and 1 oropharyngeal swab from a turkey were included in the specimens from case-patient poultry farm; both samples were positive for influenza A(H7N9) and A(H9N2). All other cloacal and/or oropharyngeal swab specimens were from local chickens.
†H9-positive samples from the case-patient poultry farm were influenza A(H9N2). H9-positive samples from other sources were not further characterized by subtype.
‡Distributors bought poultry from companies or local farmers (source farms) and then sold the poultry to others, including the case-patient. Poultry was kept at distributors’ farms before resale. Samples were taken from transport vehicles and farms of 2 distributors who transported the chickens to the case-patient’s farm. All positive specimens were from a single distributor: 3 from his transport vehicle and 1 from his farm.
§Eight farms that supplied the birds to the case-patient (source farms) and 56 other farms located in the villages of the case-patient and source farms.

Main Article

Page created: October 17, 2014
Page updated: October 17, 2014
Page reviewed: October 17, 2014
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.