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Swine Flu #2
Different influenza strains combine in pigs to create new reassortants. Ultimately these are shown coming together in the pig at the bottom of the picture. In this pig, the green and purple virions are shown infecting a cell (red cytoplasm and purple nucleus). Their genetic material reassorts giving rise to a new flu strain (blue) that can spread from person to person as in the new Mexican H1N1 swine flu.
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