Swine influenza virus (referred to as SIV) refers to influenza cases that are caused by Orthomyxoviruses endemic to pig populations. SIV strains isolated to date have been classified either as Influenzavirus C or one of the various subtypes of the genus Influenzavirus A.[1]
In More simple terms : Swine Influenza (swine flu) is a respiratory disease of pigs caused by type A influenza that regularly cause outbreaks of influenza among pigs. Swine flu viruses do not normally infect humans, however, human infections with swine flu do occur, and cases of human-to-human spread of swine flu viruses has been documented. See General Information about Swine Flu. more : http://www.cdc.gov/swineflu/
Swine flu infects people every year and is found typically in people who have been in contact with pigs, although there have been cases of person-to-person transmission.[2] Symptoms include fever, disorientation, stiffness of the joints, vomiting, and loss of consciousness ending in death.[3] Swine influenza is known to be caused by influenza A subtypes H1N1,[4] H1N2,[4] H3N1,[5] H3N2,[4] and H2N3.[6]
In swine, three influenza A virus subtypes (H1N1, H3N2, and H1N2) are circulating throughout the world.[citation needed] In the United States, the H1N1 subtype was exclusively prevalent among swine populations before 1998; however, since late August 1998, H3N2 subtypes have been isolated from pigs. As of 2004, H3N2 virus isolates in US swine and turkey stocks were triple reassortants, containing genes from human (HA, NA, and PB1), swine (NS, NP, and M), and avian (PB2 and PA) lineages.[7]
Taken from : http://en.wikipedia.org/wiki/Swine_Flu
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