Influenza Virus Surveillance in Coordinated Swine Production Systems, United States

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.

Keywords

• influenza
• viruses
• swine
• surveillance
• H1N1
• H3N2