Chinese health authorities are trying to identify what is causing an outbreak of pneumonia in the central city of Wuhan, officials said on Friday, as the tally of cases rose to 44 and Singapore said it would screen arrivals on flights from there.
Chinese health authorities are trying to identify what is causing an outbreak of pneumonia in the central city of Wuhan, officials said on Friday, as the tally of cases rose to 44 and Singapore said it would screen arrivals on flights from there.