What are viruses?
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 Jun 2 2010, 12:07 PM
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242 posts Joined: Nov 2009  
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H5N1, H1N1, HIV, nipah virus, many of them were unknown 50 years ago. How do these viruses spring out of the woodwork and turn infectious all of a sudden? If they mutated from some benign form, what's causing them to suddenly mutate, and why now?
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