Transmission of influenza A viruses between pigs and people, Iowa, 2002-2004.Terebuh P., Olsen C.W., Wright J., Klimov A., Karasin A., Todd K., Zhou H., Hall H., Xu X.[...], Bridges C.B.PubMedEurope PMCInfluenza Other Respi Viruses 4:387-396 (2010)