Experts say they have now confirmed the identity of a virus which may have killed more than 50 people worldwide.
The US Centers for Disease Control says that a Corona virus - possibly a strain never before seen in humans - is to blame.

Other types of Corona virus can cause the common cold.

The results came as increasing concern over the infection prompted the closure of all Hong Kong schools for more than a week.

The Hong Kong government has ordered people who believe they have been exposed to the virus to stay away from work - or be fined or jailed.

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BBC Health News