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  1. Influenza viruses that are normally found in swine are known as swine influenza viruses (SIVs). The known SIV strains include influenza C and the subtypes of influenza A known as H1N1, H1N2, H3N1, H3N2 and H2N3. Pigs can also become infected with the H4N6 and H9N2 subtypes. Swine influenza virus is common throughout pig populations worldwide.

  2. Influenza A virus subtype H7N9 (A/H7N9) is a bird flu strain of the species Influenza virus A (avian influenza virus or bird flu virus). Avian influenza A H7 viruses normally circulate amongst avian populations with some variants known to occasionally infect humans. An H7N9 virus was first reported to have infected humans in March 2013, in China.

  3. Influenza A virus, el virus que causa la gripe aviaria.Micrografía electrónica de transmisión de viriones en tinción negativa (claros sobre fondo oscuro). (Fuente: Dr. Erskine Palmer, Imagen de los Centros para el Control y la Prevención de Enfermedades).

  4. Il virus dell'influenza A sottotipo H1N1 è un ceppo virale del virus dell'influenza A, l'unico appartenente al genere Influenzavirus A, della famiglia Orthomyxoviridae. Ne esistono numerose varianti che causano forme influenzali pandemiche negli animali e negli umani, come la febbre suina .

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