This year's flu is that aggressive strain of H1N1, and in addition to the old and sick who are typically at risk, it's striking even young to middle aged healthy adults. "We're seeing a lot of people who were previously healthy in their 30s, 40s, and 50s, getting very sick with flu," said Dr. Matt Davis of the University of Michigan Health System.
Click on the web extra above to see what can be done to fight the flu.
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