Redzer, nonsense.
It does, and this is very common. Pigs are the perfect host for a wide variety of viral infections. And especially viruses of the family to which the human flu, the bird flu and swine flu belong, have the special characteristic that their genetic material is segmented. That means, it's like a collection of Lego bricks which you can assemble in a great many meaningful ways and they are compatible. If a pig gets infected by all of them at the same time, which is not too unlikely, it may happen that the viruses' genetic material gets mixed. This results in new combinations in a very natural way. ("Reassortment" and "antigenic shift" are keywords to be looked up.)i mean how does a virus just appear from nowhere?
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