The World Health Organisation (WHO) said last week that seven more people in China had been found to be infected with the H7N9 strain of bird flu in the previous week, taking to around 150 the total number of cases so far.
Experts say there is no evidence as yet of any easy or sustained person-to person transmission of the strain. But an early scientific analysis of probable transmission of the new flu from person to person, published last August, gave the strongest proof yet that it can at times jump between people and so could cause a human pandemic.
The WHO said the source of the human infections was still being investigated. It stressed that it does not advise any special screening for people going in and out of China, nor does it recommend any travel or trade curbs.
(Reporting by Sui-Lee Wee; Editing by Clarence Fernandez)
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