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China: Reports of bird flu in humans reach 60

From Melissa Gray and Paul Armstrong, CNN
updated 5:56 AM EDT, Mon April 15, 2013
A janitor sprays disinfectant over empty chicken cages at a market in New Taipei City, Taiwan, on Monday, April 29. Asian countries have stepped up vigilance against the spread of H7N9 bird flu after a case of the deadly strain showed up in Taiwan, the first outside mainland China. A janitor sprays disinfectant over empty chicken cages at a market in New Taipei City, Taiwan, on Monday, April 29. Asian countries have stepped up vigilance against the spread of H7N9 bird flu after a case of the deadly strain showed up in Taiwan, the first outside mainland China.
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STORY HIGHLIGHTS
  • NEW: 13 dead from a total of 60 cases of bird flu in China, authorities say
  • The virus is normally found in birds
  • H7N9 was never known to infect people until last month
  • Cases of the virus have now spread to central and northern China

Hong Kong (CNN) -- Two more people infected with a rare strain of bird flu in China died over the weekend, as the number of human cases of H7N9 climbed to 60, state media reported Sunday.

The two deaths, both in Shanghai, takes the death toll to 13, the Xinhua news agency said.

Shanghai's health authorities have now reported 24 cases, after three men were diagnosed with H7N9 on Saturday.

The virus also appears to have spread beyond eastern China for the first time. Two new cases were reported in central Henan Province on Sunday morning, while a child in Beijing in the north tested positive on Saturday.

Poultry markets closed over bird flu
China on high alert over bird flu
New deadly strain of bird flu in China

The H7N9 strain is normally found in birds and was never known to infect people until last month.

The World Health Organization (WHO) said China had been infected with a new variation of bird flu. The agency said it continued to look for the source of the infection.

"Investigations into the possible sources of infection and reservoirs of the virus are ongoing," the organization announced on Saturday. "Until the source of infection has been identified, it is expected that there will be further cases of human infection with the virus in China."

So far, WHO said, there is no evidence of ongoing human-to-human transmission.

A possible source for the infections is poultry markets, which have become the focus of investigation by China's health ministry and WHO.

Several cities in eastern China have suspended trading in live poultry in an effort to contain the problem.

Chinese scientists said the H7N9 virus probably came from migratory birds from East Asia that mixed with domestic fowl around Shanghai.

The new variation of bird flu has genetic characteristics that make it well-adapted to infect humans, the New England Journal of Medicine said.

CNN's Hilary Whiteman contributed to this report

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