Concerns are rising over an outbreak of a mysterious Chinese virus, as some leading scientists suggested that more than 1,700 people may already have been infected, far more than had been thought.
On Saturday Chinese health authorities said they had discovered four more suspected cases in the central city of Wuhan, bringing the total number of suspected cases of the pneumonia-like illness in the city up to 45.
But experts are warning that significant uncertainties remain about the severity and spread of the illness, which has already killed two people and evoked memories of the SARS outbreak which proved fatal for hundreds of people more than 15 years ago.
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