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THERE ARE no hard answers but a consensus is emerging: The disease in Mexico has likely been around longer and infected more people than investigators can confirm.
Swine influenza or flu, is a contagious respiratory disease that affects pigs. It is caused by a virus similar to the type of flu virus that in various forms, infects people every year but is a strain typically found only in pigs -- or in people who have direct contact with pigs. There is no vaccine for the new disease and little natural immunity only.
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