SARS is a Corona virus
Swine Flu originated in USA and first human case recorded in Mexico
Corona viruses are all around us. They do not usually cross the species barrier. I guess China is a statistically likely place for this to happen a:
1 there are an awful lot of people in China
2 a lot of people live in close proximity to animals for example chickens. The current outbreak may have originated in a market selling wild animals.
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