Er JC, Lium B, Framstad T. Antibodies of Influenza A(H1N1)pdm09 virus in pigs' sera cross-react with other
influenza A virus subtypes. A retrospective epidemiological interpretation of
Norway's serosurveillance data from 2009-2017. Epidemiol Infect 2020 Mar 13:1-30. doi: 10.1017/S0950268820000643.
PMID: 32167441