Swine flu - one of the dangerous flu ever found out.

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Many persons suffers from common flu and they recover from it very quickly.Recently there was a rumour of bird flu and many people have died from it too.But swine flu is the latest flu found by the doctors which is mainly found in pigs.First of all person who suffer will have the symptoms like headache, cold and so on and when the virus have got deep into our body the victim cannot bear the pain and if he is not cured timely he may die..but the doctors have found out the cure for it..So what might be the reason for these flu to come in our human life and can we simply be safe from them..