Influenza — United States
The role of exhibition swine in influenza A virus (IAVs) transmission was recently demonstrated by over 300 human infections of H3N2v viruses while attending agricultural fairs. Through active IAV surveillance in US exhibition swine and whole-genome sequencing of 380 isolates, we demonstrate that exhibition swine are actively involved in the evolution of IAVs, including zoonotic strains. First, frequent introduction of IAVs from commercial swine populations provides new genetic diversity in
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