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EPIDEMICS
H7N9 flu: New map pinpoints Asian countries at risk
by Staff Writers
Paris (AFP) June 17, 2014


Five Asian countries could join China as targets for the H7N9 bird flu virus that has claimed about a hundred lives since it erupted in March 2013, scientists said Tuesday.

Parts of Bangladesh, India, Indonesia, the Philippines and Vietnam are at risk because, like China, they have live bird markets in densely-populated areas, the team said.

Places potentially at risk include urban centres on the coast of east and southeast China where H7N9 has not been reported; parts of the Bengal regions of Bangladesh and India; Vietnam's Red River and Mekong deltas; and isolated areas of Indonesia and the Philippines.

A map published in the journal Nature Communications, seeks to provide watchdogs with a tool to identify H7N9's possible flare points.

H7N9 is the second bird virus alongside H5N1 to have emerged in recent years through live markets, where traders and shoppers come in close contact with infected chickens and ducks.

H5N1 is far more dangerous for humans than H7N9 but its spread through birds is more easily detectable, as poultry usually show signs of being sick from it.

H7N9 can be asymptomatic in birds, meaning the animals may show no sign of illness.

"The slow geographical expansion of the reported H7N9 cases in the central and southern provinces of China indicates that despite remarkably strict control efforts, H7N9 is difficult to contain along poultry market chains," the study warned.

It "may spread beyond the distribution indicated by the human cases which have thus far been reported."

The study was led by scientists at the Free University of Brussels, the International Livestock Research Institute, Oxford University and the Chinese Centre for Disease Control and Prevention.

Looking at the evidence from northeastern China, where chicken production is intensive, the researchers said industrial-scale farms were unlikely to have played a significant role in spreading H7N9 there.

This backs previous research that smaller farms, where domestic fowl are likelier to come into contact with wild birds, and trading in infected poultry at local markets were major channels for spreading the virus.

H7N9 initially ignited fears that it could mutate to become easily transmissible between people, which might lead to a global pandemic.

But Chinese officials and the World Health Organisation (WHO) say there is no evidence of sustained human-to-human transmission, despite sporadic cases among members of the same family.

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