Swine flu is caused due to the virus of a pig. It is also called Swine Influenza or pig flu. In Humans, this flu was first discovered in 2009. It was spreading in all over the world very fast, so WHO declared it as Pandemics. The disease is considered as highly contagious. These viruses can cause high levels of illness and low death rates in pigs. This flu is no more dangerous like other flu.
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