Kissing a pig..................... From other sick people just like this virus.
The
2009 flu pandemic or
swine flu was an
influenza pandemic that lasted from early 2009 to late 2010, and the second of the two pandemics involving
H1N1 influenza virus (the first being the 1918–1920
Spanish flu pandemic), albeit a new strain. First described in April 2009, the virus appeared to be a new strain of H1N1 which resulted when a previous triple
reassortment of bird, swine, and human flu viruses further combined with a Eurasian pig flu virus,
[5] leading to the term "
swine flu".
[6] It is estimated that 11–21% of the then global population (of about 6.8 billion), or around 700 million–1.4 billion people, contracted the illness – more in absolute terms than the
Spanish flu pandemic,
[3][7] with about 150,000–575,000 fatalities.
[4] A follow-up study done in September 2010 showed that the 2009 H1N1 flu was no more severe than the yearly seasonal flu.
[8]