Um....this class of virus jumps from animals to people every year. Pigs to people, to be precise, then drifts over the rest of the world in a yearly version (or versions, because sometimes there are two or three) generically termed Type (number here) Asian Flu.
The media hysteria hyping over this is getting on my nerves. I love the way the public just knows it's the plague now. We're all gonna die, just like with The Stand. When I go to Google News in the morning, I have to SEARCH for news about Iraq, Afghanistan, Galloway and Israel, for instance, because the headlines are all SARS, SARS, SARS, SARS.
West Nile mutates, and it killed a lot more people in North America than SARS has.