EN
Wild boars (Sus scrofa) are widely distributed in many countries. In recent years, their population has been expanding in most regions, despite hunting. Wild boars are known reservoirs for a number of infectious diseases that are transmissible to pigs and humans. Swine influenza (SI) is a viral respiratory disease of pigs of substantial importance both for the swine production sector and for public health. The aim of the paper is to describe the exposure to SIV of 2801 wild boars shot in 12 voivodeships of Poland from 2011 to 2014. It was assessed by the HI test. In 2011/2012, antibodies to H1N1 were found in 6.43% of wild boars’ sera. In 3.07% of sera the seroconversion to H3N2 was noted. In 2012/2013, 6.23% of sera examined were positive for H1N1, 2.67% of sera were positive for H3N2 and 3.76% of sera had antibodies to A(H1N1)2009pdm-like. In the following hunting season, antibodies to H1N1, H3N2 and A(H1N1)2009pdm-like were detected in 7.74%, 2.27% and 1.74% of samples, respectively. In 2011-2014, there were no sera samples positive for the H1N2 virus. In total, the percentage of wild boars with antibodies to SIV ranged from 0 to 6.25%, depending of the subtype. In some animals, mixed infections with different subtypes of SIV were found. In general, antibody titers were low. In summary, we confirm the exposure of wild boars’ population in Poland to SIV. On the basis of the results obtained, we suggest that their role in SIV transmission to pigs and humans has been limited. This situation may change, and therefore the monitoring of wild boars’ health status should be continued.