[1. Busquets N., Segales J., Cordoba L., Mussa T., Crisci E., Martin-Valls G.E., Simon-Grife M., Perez-Simo M., Perez-Maillo M., Nunez J.I., Abad F.X., Fraile L., Pina S., Majo N., Bensaid A., Domingo M., Montoya M.: Experimental infection with H1N1 European swine influenza virus protects pigs from an infection with the 2009 pandemic H1N1 human influenza virus. Vet Res 2010, 41, 74.10.1051/vetres/2010046293969920663475]Search in Google Scholar
[2. Cador C., Hervé S., Andraud M., Gorin S., Paboeuf F., Barbier N., Quéguiner S., Deblanc C., Simon G., Rose N.: Maternally-derived antibodies do not prevent transmission of swine influenza A virus between pigs. Vet Res 2016, 47, 86.10.1186/s13567-016-0365-6498804927530456]Search in Google Scholar
[3. Chan M.: World Health Organization – WHO. http://who.int/mediacentre/news/statements/2009/h1n1-pandemic-phase6-20090611/en/index.]Search in Google Scholar
[4. De Vleeschauwer A.R., Van Poucke S.G., Karasin A.I., Olsen C.W., Van Reeth K.: Cross-protection between antigenically distinct H1N1 swine influenza viruses from Europe and North America. Influenza Other Respir Viruses 2011, 5, 115–122.10.1111/j.1750-2659.2010.00164.x494200721306575]Search in Google Scholar
[5. Er C., Skjerve E., Brun E., Framstad T., Lium B.: Occurrence and spread of influenza A(H1N1)pdm09 virus infection in Norwegian pig herds based on active serosurveillance from 2010 to 2014. Epidemiol Infect 2016, 144, 3148–3165.10.1017/S0950268816001424508067227412705]Search in Google Scholar
[6. Fablet C., Marois-Créhan C., Simon G., Grasland B., Jestin A., Kobisch M., Madec F., Rose N.: Infectious agents associated with respiratory diseases in 125 farrow-to-finish pig herds: a cross-sectional study. Vet Microbiol 2012, 157, 152–163.10.1016/j.vetmic.2011.12.01522226820]Search in Google Scholar
[7. Kuntz-Simon G., Madec F.: Genetic and antigenic evolution of swine influenza viruses in Europe and evaluation of their zoonotic potential. Zoonoses Public Health 2009, 56, 310–325.10.1111/j.1863-2378.2009.01236.x19497089]Search in Google Scholar
[8. Kyriakis C.S., Papatsiros V.G., Athanasiou L.V., Valiakos G., Brown I.H., Simon G., Van Reeth K., Tsiodras S., Spyrou V., Billinis C.: Serological evidence of pandemic H1N1 influenza virus infections in Greek swine. Zoonoses Public Health 2016, 63, 370–373.10.1111/zph.1223526477456]Search in Google Scholar
[9. Maes D., Deluyker H., Verdonck M., Castryck F., Miry C., Vrijens B., de Kruif A.: Herd factors associated with the seroprevalence of four major respiratory pathogens in slaughter pigs from farrow-to-finish pig herds. Vet Rec 2000, 31, 313–327.10.1051/vetres:2000122]Search in Google Scholar
[10. Markowska-Daniel I., Pomorska-Mól M., Pejsak Z.: The influence of age and maternal antibodies on the postvaccinal response against swine influenza viruses in pigs. Vet Immunol Immunopathol 2011, 142, 81–86.10.1016/j.vetimm.2011.03.01921501880]Search in Google Scholar
[11. Markowska-Daniel I., Kwit K., Urbaniak K., Kowalczyk A.: Serological evidence of co-circulation of different subtypes of swine influenza virus in polish pigs herds. Bull Vet Inst Pulawy 2012, 56, 425–429.10.2478/v10213-012-0075-4]Search in Google Scholar
[12. Markowska-Daniel I., Urbaniak K., Porowski M., Karbowiak P., Kowalczyk A., Kozak E., Pejsak Z.: Emergence of pandemic H1N1 2009 influenza A virus in swine herds in Poland. Bull Vet Inst Pulawy 2013, 57, 293–300.10.2478/bvip-2013-0051]Search in Google Scholar
[13. Mastin A., Alarcon P., Pfeiffer D., Wood J., Williamson S., Brown I., COSI Consortium, Wieland B.: Prevalence and risk factors for swine influenza infection in the English pig population. PLoS Curr 2011, 3, RRN1209.10.1371/currents.RRN1209303288021637347]Search in Google Scholar
[14. Merialdi G., Dottori M., Bonilauri P., Luppi A., Gozio S., Pozzi P., Spaggiari B., Martelli P.: Survey of pleuritis and pulmonary lesions in pigs at abattoir with focus on the extend of the condition and herd risk factors. Vet J 2012, 193, 234–239.10.1016/j.tvjl.2011.11.00922182431]Search in Google Scholar
[15. Meyns T., Van Steelant J., Rolly E., Dewulf J., Haesebrouck F., Maes D.: A cross-sectional study of risk factors associated with pulmonary lesions in pigs at slaughter. Vet J 2011, 187, 388–392.10.1016/j.tvjl.2009.12.02720122861]Search in Google Scholar
[16. Olsen C.W., Brown I.H., van Reeth K.: Swine influenza. In: Disease of swine, edited by Straw B.E., Zimmerman J.J., D’Allaire S., Taylor D.J., State University Press, Ames, 2006, pp. 469–482.]Search in Google Scholar
[17. Pascu C., Costinar L., Herman V.: Enzyme-linked immunosorbent assay detection of antibodies against swine influenza virus in western Romania. J Swine Health Prod 2012, 20, 87–90.]Search in Google Scholar
[18. Pomorska-Mól M., Markowska-Daniel I., Kwit K., Czyżewska E., Dors A., Rachubik J., Pejsak Z.: Immune and inflammatory response in pigs during acute influenza caused by H1N1 swine influenza virus. Arch Virol 2014, 159, 2605–2614.10.1007/s00705-014-2116-1417311124846450]Search in Google Scholar
[19. Qiu Y., De Hert K., Van Reeth K.: Cross-protection against European swine influenza viruses in the context of infection immunity against the 2009 pandemic H1N1 virus: studies in the pig model of influenza. Vet Res 2015, 46, 105.10.1186/s13567-015-0236-6458148926404790]Search in Google Scholar
[20. Rose N., Hervé S., Eveno E., Barbier N., Eono F., Dorenlor V., Andraud M., Camsusou C., Madec F., Simon G.: Dynamics of influenza A virus infections in permanently infected pig farms: Evidence of recurrent infections, circulation of several swine influenza viruses and reassortment events. Vet Res 2013, 44, 72.10.1186/1297-9716-44-72384637824007505]Search in Google Scholar
[21. Simon G., Larsen L.E., Dürrwald R., Foni E., Harder T., Van Reeth K., Markowska-Daniel I., Reid S.M., Dan A., Maldonado J., Huovilainen A., Billinis C., Davidson I., Agüero M., Vila T., Hervé S., Breum S.Ø., Chiapponi C., Urbaniak K., Kyriakis C.S., ESNIP3 consortium., Brown I.H., Loeffen W.: European surveillance network for influenza in pigs: Surveillance programs, diagnostic tools and swine influenza virus subtypes identified in 14 European countries from 2010 to 2013. PLoS One 2014, 9, e115815.10.1371/journal.pone.0115815427736825542013]Search in Google Scholar
[22. Simon-Grifé M., Martín-Valls G.E., Vilar M.J., García-Bocanegra I., Mora M., Martín M., Mateu E., Casal J.: Seroprevalence and risk factors of swine influenza in Spain. Vet Microbiol 2011, 149, 56–63.10.1016/j.vetmic.2010.10.01521112702]Search in Google Scholar
[23. Suriya R., Hassan L., Omar A.R., Aini I., Tan C.G., Lim Y.S., Kamaruddin M.I.: Seroprevalence and risk factors for influenza A viruses in pigs in Peninsular Malaysia. Zoonoses Public Health 2008, 55, 342–351.10.1111/j.1863-2378.2008.01138.x18667027]Search in Google Scholar
[24. Takemae N., Sujira Parchariyanon S., Ruttanapumma R.Y., Tsuyoshi Hayashi T., Yuko Uchida Y., Takehiko Saito T.: Swine influenza virus infection in different age groups of pigs in farrow-to-finish farms in Thailand. Virol J 2011, 8, 537.10.1186/1743-422X-8-537330898222166074]Search in Google Scholar
[25. Taubenberger J.K., Kash J.C.: Influenza virus evolution, host adaptation, and pandemic formation. Cell Host Microbe 2010, 7, 440–451.10.1016/j.chom.2010.05.009289237920542248]Search in Google Scholar
[26. Vincent A., Awada L., Brown I., Chen H., Claes F., Dauphin G., Mumford E.: Review of influenza A virus in swine worldwide: a call for increased surveillance and research. Zoonoses Public Health 2014, 61, 4–17.10.1111/zph.1204923556412]Search in Google Scholar
[27. Zell R., Scholtissek C., Ludwig S.: Genetics, evolution, and the zoonotic capacity of European swine influenza viruses. Curr Top Microbiol Immunol 2013, 370, 29–55.10.1007/82_2012_26723011571]Search in Google Scholar