Swine flu is a pervasive disease that has been impacting large number of people in America. This disease is mainly caused due to a certain influenza virus commonly referred to as Swine Influenza Virus (SIV).
It is a widespread ailment that usually attacks pigs and reportedly; pigs of several American regions like South America, Mexico and Canada are infected by it.
Origins Of The Disease
Recently, several theories about the spread and origin of swine flu have been propounded. The most common belief is that this flu-type saw its beginnings in the year 1930 in the United States.
However, there were cases of a similar disease that became visible around 1918. During the flu-epidemic in 1918, this ailment was projected as a virus co-related to human influenza.
Several cases of pigs falling ill along with humans were reported during this period.
Generally, medical history shows that swine flu is caused by certain categories of influenza. Mostly, this sickness is rooted into Influenza –A category and its subtypes – H1N1, H1N2, H2N3 and H3N2.
