May 1, 2009 6:40 PM

Researchers can't agree on severity of swine flu outbreak

More than a month into the swine flu outbreak that has now affected 13 countries, medical experts are wondering aloud whether the contagious disease will ever become the deadly pandemic that everyone fears. With at least 143 infections now confirmed in 23 states, the H1N1 virus continues to spread via person-to-person transmission. But they overwhelmingly have been mild.

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