Long-Term Serological Investigations of Influenza A Virus in Free-Living Wild Boars (<i>Sus scrofa</i>) from Northern Italy (2007-2014).

During the study period, we observed a high H1N1 seroreactivity, followed by a decreasing trend in the available IAV-positive samples, amounting to 95.7% (45/47) in 2009, 100% (8/8) in 2010, 50% (4/8) in 2011, 5.6% (1/18) in 2012, 50% (1/2) in 2013 and finally 0% (0/4) in 2014 ( Table 1 ).

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