The H1N1 strain was based on an unusual influenza virus that has been circulating in U.S. pigs since the mid-1990s. “Somehow, a single pig became simultaneously infected with that virus and a pure swine flu strain found in pigs in Europe and Asia. The two strains swapped genetic material to produce the new H1N1 strain, which then began to infect humans.” The first victim of swine flu was located in Veracruz, Mexico.
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