"For many years, researchers assumed that flu strains were mostly the product of China and Southeast Asia.But a team at the University of Michigan, the Howard Hughes Medical Institute and Florida State University found that not all strains of flu circulating in North America die off at the end of influenza season.
Some of those appear to head to South America, and some migrate even farther, they reported. That may have happened with the H1N1 swine flu pandemic, they added."
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