THE World Health Organisation is playing down fears over a strain of bird flu which has killed two people in China.
However, it says it is crucial to find out how the virus infected humans.
"It's the first time that H7N9 was found in humans," the UN health agency's spokeswoman Fadela Chaib told reporters on Tuesday, referring to the deadly strain of avian influenza.
"It is of concern to WHO and we will be following this with the health authorities in China to know more. But for the time being, it's only three cases and it has shown, for the time being, no human-to-human transmission," she added.
China's National Health and Family Planning Commission said over the weekend two men, aged 87 and 27, died in Shanghai in early March after being infected with H7N9 avian influenza.
The presence of the virus in the victims was only confirmed on Friday.
A 35-year-old woman in the eastern province of Anhui, near Shanghai, was in critical condition with the virus, the commission said.
"To date the investigation showed no link between the three cases, but the investigation is still ongoing," said Chaib, adding that 88 individuals who had been in contact with the victims were being monitored.
"The state of knowledge as of now is limited," she underlined.
Shanghai's health bureau has ordered hospitals to strengthen surveillance of respiratory illness cases.
"They are taking the measures necessary," said Chaib.
The woman from Anhui had contact with birds, while the younger man in Shanghai worked butchering and selling meat, China's state-backed Health News said on its website on Monday, suggesting a route for transmission.
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