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Once in a while a couple different virus subtypes will infect the same host, and while they are there, they mix their genes up and make a whole new virus subtype. For example, an H1N2 virus and H3N1 virus can mix with each other and reassort their genes, making a NEW H1N1 virus. This is essentially where the NEW STRAIN (subtype) of H1N1 flu came from.
