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Emerg Infect Dis
; 21(10): 1834-6, 2015 Oct.
Article
in English
| MEDLINE
| ID: mdl-26402228
ABSTRACT
To clarify the epidemiology of influenza A viruses in coordinated swine production systems to which no animals from outside the system are introduced, we conducted virologic surveillance during September 2012-September 2013. Animal age, geographic location, and farm type were found to affect the prevalence of these viruses.
