The swine flu

The swine flu or H1N1, was transmitted to the world by pigs. They carried the virus which then lead to humans being effected by it. The effects Swine flu were similar to the ones of influenza, for example, fever, colds, coughs, sore throats, headaches, body aches and fatigue. Over 18000 people had died since the virus came out in April 2009, if there were no vaccines there would have been over 500000 deaths worldwide due to Swine Flu. Countries worldwide were affected by the virus. All continents had cases of swineflue related deaths and illness.

http://en.wikipedia.org/wiki/Swine_influenza

http://news.bbc.co.uk/2/hi/8083179.stm