Dr. Amy Baker, USDA ARSDr. Amy Baker, USDA ARS, discusses the biology of influenza A virus in swine and how that impacts swine and human health. Mammalian-adapted lineages of influenza A viruses in swine include H1N1, H1N2 and H3N2, which can result in exchange of viruses between pigs and people. “There have been more than 680 swine influenza detections from 39 lineages in 24 countries.”Surveillance for IAV in swine has benefits for swine and public health. “To summarize, swine influenza viruses are highly diverse in the US and globally,” Baker says. “Robust surveillance and disease investigation are the foundation for improving intervention strategies for animal health and public health,” Baker says.