WHO warns of Sars 'false alarms'

The news comes as Chinese media reported that a patient suspected of having Sars in the southern city of Shenzhen in fact has pneumonia.

WHO spokesman Bob Dietz told the Associated Press it was still difficult to test for Sars and people just with colds or a fever could be misdiagnosed.

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China confirmed its first new case of Sars in months earlier this month.

The 32-year-old man, from Guangdong province, has since recovered.