|LEE DONG-HUN - Orise Fellow|
|TORCHETTI, MIA - Animal And Plant Health Inspection Service (APHIS)|
|KILLIAN, MARY - Animal And Plant Health Inspection Service (APHIS)|
|BERHANE, YOHANNES - Canadian Food Inspection Agency|
Submitted to: Emerging Infectious Diseases
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/2/2017
Publication Date: 11/1/2017
Citation: Lee Dong-Hun, Torchetti, M.K., Killian, M.L., Berhane, Y., Swayne, D.E. 2017. Highly pathogenic avian influenza A(H7N9) virus, Tennessee, USA, March 2017. Emerging Infectious Diseases. 23(11):1860-1863. https://dx.doi.org/10.3201/eid2311.171013.
Interpretive Summary: The deadly form of avian influenza (highly pathogenic avian influenza) was detected in chickens in Tennessee during March 2017. Examination for other avian influenza viruses in the area and genetic analysis of such viruses supports multiple independent introductions of a mild avian influenza virus (low pathogenicity avian influenza) from wild bird to farms at the border of Tennessee and Alabama. On one farm, the mild form changed to the deadly for by mutation and subsequent spread to a second farm.
Technical Abstract: In March 2017, highly pathogenic avian influenza A(H7N9) was detected at 2 poultry farms in Tennessee, USA. Surveillance data and genetic analyses indicated multiple introductions of low pathogenicity avian influenza virus before mutation to high pathogenicity and interfarm transmission. Poultry surveillance should continue because low pathogenicity viruses circulate and spill over into commercial poultry.