H1N1 'Swine' Flu Makes a Comeback in Mexico
Quick ReadHealth experts say Americans shouldn't be overly concerned
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It was just about three years ago that a strange new strain of flu first appeared in Mexico, then spread across the border to the United States and eventually much of the globe.
The H1N1 "swine" flu strain didn't behave like a "normal" flu, because it proved particularly dangerous to children and younger adults -- the very groups of people who usually have the strongest defenses against seasonal...
