TY - JOUR AU - Corzo, Cesar AU - Culhane, Marie AU - Juleen, Kevin AU - Stigger-Rosser, Evelyn AU - Ducatez, Mariette AU - Webby, Richard AU - Lowe, James T1 - Active Surveillance for Influenza A Virus among Swine, Midwestern United States, 2009–2011 T2 - Emerging Infectious Disease journal PY - 2013 VL - 19 IS - 6 SP - 954 SN - 1080-6059 AB - Veterinary diagnostic laboratories identify and characterize influenza A viruses primarily through passive surveillance. However, additional surveillance programs are needed. To meet this need, an active surveillance program was conducted at pig farms throughout the midwestern United States. From June 2009 through December 2011, nasal swab samples were collected monthly from among 540 groups of growing pigs and tested for influenza A virus by real-time reverse transcription PCR. Of 16,170 samples, 746 were positive for influenza A virus; of these, 18.0% were subtype H1N1, 16.0% H1N2, 7.6% H3N2, and 14.5% (H1N1)pdm09. An influenza (H3N2) and (H1N1)pdm09 virus were identified simultaneously in 8 groups. This active influenza A virus surveillance program provided quality data and increased the understanding of the current situation of circulating viruses in the midwestern US pig population. KW - Influenza KW - surveillance KW - monitoring KW - swine KW - viruses KW - midwestern United States KW - United States DO - 10.3201/eid1906.121637 UR - https://wwwnc.cdc.gov/eid/article/19/6/12-1637_article ER - End of Reference