Mutating Bird Flu May Pose Pandemic Threat

A wave of H7N9 bird flu in China that has spread into people may have the potential to emerge as a pandemic strain in humans, scientists said on Wednesday.

The H7N9 virus, one of several strains of bird flu known to be able to infect humans, has persisted, diversified and spread in chickens across China, the researchers said, fuelling a resurgence of infections in people and posing a wider threat.

"The expansion of genetic diversity and geographical spread indicates that, unless effective control measures are in place, H7N9 could be expected to persist and spread beyond the region," they said in a study published in the journal Nature.

The H7N9 bird flu virus emerged in humans in March 2013 and has since then infected at least 571 people in China, Taipei, Hong Kong, Malaysia and Canada, killing 212 of them, according to February data from the World Health Organization (WHO).

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