Swine influenza (swine flu) is caused by an influenza virus type and pig influenza. Regular influenza epidemics cause swine flu in pigs, but death is rare. The virus can change in the pig in the whole year, but outbreaks occur not later than in autumn and winter in households of persons. The swine flu virus (a type of influenza virus A H1N1) was the first of a series of pigs in 1930.
Like humans, pigs can influenza (flu), but the influenza virus, swine influenza is not like the people. Swine flu is not often infect humans, and the few cases that exist in the past, primarily the individuals concerned, their direct contact with pigs. But the recent swine flu epidemic is different. This will be replaced by a new influenza virus, swine are the people - and this in a nation which does not comply with the pigs.
Like all flu, swine influenza virus in constant motion. Pigs can be infected by avian influenza and human influenza virus, swine fever. If the flu from different species to infect pigs, the virus re-assortment and May, before a mixture of pork, for human and / or avian influenza virus. Over the years various types of swine influenza viruses are. Currently there are four different subtypes of the flu virus pair pigs: H1N1, H1N2, H3N2 and H3N1. With some recent influenza virus from pigs are H1N1 virus.
Swine influenza viruses are not usually infect humans. But in human infections with swine flu instead. Generally, such cases occur among persons in direct contact with pigs, as the children in the vicinity of swine in the right of workers and the swine.
As in the case of a person spread of the flu in the other pigs. In 1988, an outbreak of bird flu infection of swine fever in Wisconsin visible to more people infected, and even if no explosion caused in the community, have antibody evidence of transmission of the virus from patients to healthcare workers in contact with the patients in the vicinity.
Please note: the swine flu virus is not about the food. You can not flu eat pork or pork products based on pork.