Swine Flu H1N1

The first time swine flu was declared to be a human related disease was in 1918 during a pandemic of the flu. During this time, humans were becoming sick at the same time pigs were becoming sick. An estimation of 50 to 100 million deaths were reported worldwide. From 1918 to 1997, the swine influenza was almost exclusively H1N1.

Between 1997 and 2002, new strains were found to cause influenza in pigs in North America. However, the transmission of swine from pigs directly to humans is very rare. When this does occur, it is called zoonotic swine flu. Since 1958, there are a total of 50 cases known of zoonotic to have been reported since the first published medical report.

There are different strains and subtypes of influenza. The most recent outbreak known as H1N1 was detected in March 2009. It is believed to have started in Mexico. The first cases detected in the United States were also in March and early April found in California and Texas. The swine flu has come from a strain of the influenza virus just like any other flu. This particular type is considered more dangerous because the human population has never experienced this type of Swine flu. Therefore many people will not have any natural resistance. Because of this, people may have more severe reactions and spread it more easily.