News+on+the+Swine+Flu

=How is influenza a fast mutating virus?= media type="custom" key="3716325" media type="custom" key="3716307" =Latest news on Swine Flu= rss url="http://topics.nytimes.com/top/reference/timestopics/subjects/i/influenza/swine_influenza/index.html?rss=1" link="true" description="true" number="10" date="true" enclosure="true"