Volume 20, Number 11—November 2014
Human Influenza A(H7N9) Virus Infection Associated with Poultry Farm, Northeastern 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|
|Environmental swab samples (chicken troughs)||13||7 (54)||0||0|
|Oropharyngeal samples||20||7 (35)||1 (5)||3 (15)|
|Cloacal and oropharyngeal samples
|Environmental samples from distributors’ farms and transport vehicles‡
|Source farms and other area farms§|
|Environmental swab samples (chicken troughs)||150||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.