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China bird flu cases now at 102

By Melissa Gray and Paul Armstrong, CNN
April 22, 2013 -- Updated 0938 GMT (1738 HKT)
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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Bird flu scare spreads
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STORY HIGHLIGHTS
  • The cases include 20 deaths, and 102 infection cases
  • Seventy patients are hospitalized with the virus
  • The new strain wasn't known until three weeks ago
  • International experts in China to monitor the H7N9 strain

(CNN) -- The number of bird flu cases in China jumped Sunday to 102, including 20 deaths, the World Health Organization announced.

Seventy patients remain hospitalized with the virus. The WHO said there is still no evidence of human-to-human transmission.

So far the virus has mainly affected eastern China, with 11 deaths and 33 infection cases reported in Shanghai, 24 cases, including three deaths, in Jiangsu Province, 38 cases, including five deaths, in Zhejiang Province, while Anhui Province has confirmed three cases, with one ending in death.

Further afield, four people -- including one in Beijing in northern China and three in central Henan Province -- have tested positive for the H7N9 virus.

The current strain of bird flu, H7N9, was not detected in humans until last month.

Map: Bird flu spread  Map: Bird flu spread
Map: Bird flu spreadMap: Bird flu spread
Poultry markets closed over bird flu

A team of international experts are currently in China conducting a week-long assessment of the virus, the WHO said on Friday.

"Right now it is still an animal virus that rarely infects humans," Dr. Michael O'Leary, the head of the WHO's office in Beijing, told reporters.

READ: Chicken still on menu, WHO says

On Thursday, the central government suspended wild bird sales to try to prevent the spread of the virus, although many questions remain as to the source of infection. It follows a ban on live poultry trading in affected provinces. A large number of birds have also been slaughtered, state-run Xinhua said.

O'Leary said there was legitimate reason for concern about the new virus, but suggested it was premature to begin mass culling of poultry.

"I eat chicken every day," O'Leary said with a laugh. "Chicken is of no concern at all."

Until March, the virus had only been present in birds, which is why they've become the focus of the investigation.

However, 40% of patients with H7N9 had not come into contact with poultry, according to the Chinese Center for Disease Control and Prevention.

Authorities are continuing to monitor more than 1,000 people who have come into close contact with confirmed cases.

CNN's Miriam Falco and Hilary Whiteman contributed to this report.

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