Different strains: There are a large number of different varieties of influenza virus that have natural affinity for different species. Bird flu and swine flu are two such strains. The animal viruses occasionally acquire the ability to infect humans.
Answered 7/12/2012
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Different strains: Avian flu (h5n1) and swine flu (h1n1) are different strains and have different rates of infection and typical courses when they infect people. The cdc has lots of great info on this. For more information... http://www.cdc.gov.
Answered 5/6/2014
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