Authorities in China say the death toll from a new strain of bird flu has reached 20, with the deaths of two more people.
The H7N9 virus has been detected in 102 people, mostly in eastern China, and 70 of those remain in hospital.
It also emerged that the virus had spread among family members in Shanghai, raising fears that it is passing between humans, Reuters reports.
Experts fear the prospect of such viruses mutating into a form easily transmissible between humans which have the potential to trigger a pandemic.
