Since this is the hot topic today, here is some reading...
http://news.nationalgeographic.com/news/2009/04/090427-swine-flu-facts.html
"That said, experts like Johns Hopkins's Pekosz and RTI's Layton say there's currently no reason to lock yourself up in the house.
"However," he said, "it certainly merits the public paying attention, and it warrants the public health efforts that have been going on in terms of monitoring and research."
http://www.dailyherald.com/story/?id=289852&src=
This one is an editorial, but I think it makes good points. http://www.prattvilleprogress.com/article/20090429/PROGRESS03/904290318/1043/progress01