China bird flu crisis

The H7N9 flu has infected 108 people in China since it was first detected in March, according to the World Health Organization. The new strain of avian flu has killed 22 people among  confirmed cases.

This Monday, April 15, 2013 electron microscope image provided by the Centers for Disease Control and Prevention shows the H7N9 virus which can take on a variety of shapes. Almost three weeks after China reported finding a new strain of bird flu in humans, experts are still stumped by how people are becoming infected when many appear to have had no recent contact with live fowl and the virus isn't supposed to pass from person to person. Understanding how the H7N9 bird flu virus is spreading is a goal of international and Chinese experts assembled by the World Health Organization as they begin a weeklong investigation Friday, April 18, 2013. (AP Photo/CDC, C.S. Goldsmith, T. Rowe)

This Monday, April 15, 2013 electron microscope image provided by the Centers for Disease Control and Prevention shows the H7N9 virus which can take on a variety of shapes. Almost three weeks after China reported finding a new strain of bird flu in humans, experts are still stumped by how people are becoming infected when many appear to have had no recent contact with live fowl and the virus isn't supposed to pass from person to person. Understanding how the H7N9 bird flu virus is spreading is a goal of international and Chinese experts assembled by the World Health Organization as they begin a weeklong investigation Friday, April 18, 2013. (AP Photo/CDC, C.S. Goldsmith, T. Rowe)

This Monday, April 15, 2013 electron microscope image provided by the Centers for Disease Control and Prevention shows the H7N9 virus which can take on a variety of shapes. Almost three weeks after China reported finding a new strain of bird flu in humans, experts are still stumped by how people are becoming infected when many appear to have had no recent contact with live fowl and the virus isn't supposed to pass from person to person. Understanding how the H7N9 bird flu virus is spreading is a goal of international and Chinese experts assembled by the World Health Organization as they begin a weeklong investigation Friday, April 18, 2013. (AP Photo/CDC, C.S. Goldsmith, T. Rowe)

This Monday, April 15, 2013 electron microscope image provided by the Centers for Disease Control and Prevention shows the H7N9 virus which can take on a variety of shapes. Almost three weeks after China reported finding a new strain of bird flu in humans, experts are still stumped by how people are becoming infected when many appear to have had no recent contact with live fowl and the virus isn't supposed to pass from person to person. Understanding how the H7N9 bird flu virus is spreading is a goal of international and Chinese experts assembled by the World Health Organization as they begin a weeklong investigation Friday, April 18, 2013. (AP Photo/CDC, C.S. Goldsmith, T. Rowe)

Medical workers take part in an exercise on dealing with a bird flu emergency at a hospital in Zibo in east China's Shandong province, Friday, April 12, 2013. A 7-year-old girl has become the first confirmed case in Beijing of the latest strain of H7N9 bird flu virus, which has killed 11 and sickened 32 in eastern China, officials said Saturday. (AP Photo) CHINA OUT

Chinese people wear face masks near a specialized fever clinic inside the Ditan Hospital, where a Chinese girl is being treated for the H7N9 strain of bird flu, in Beijing Sunday, April 14, 2013. A World Health Organization official said Sunday that it wasn't surprising that a new strain of bird flu has spread to China's capital after sickening dozens in the eastern part of the country. (AP Photo/Andy Wong)

Chinese people wear face masks near a specialized fever clinic inside the Ditan Hospital, where a Chinese girl is being treated for the H7N9 strain of bird flu, in Beijing Sunday, April 14, 2013. A World Health Organization official said Sunday that it wasn't surprising that a new strain of bird flu has spread to China's capital after sickening dozens in the eastern part of the country. (AP Photo/Andy Wong)

In this April 9, 2013 photo, a child wears a mask near the closed poultry section at the Huhuai agricultural market where the H7N9 bird flu was detected by authority in Shanghai, China. After a new and lethal strain of bird flu emerged in Shanghai two weeks ago, the government of China's bustling financial capital responded with live updates on a Twitter-like microblog. It's a starkly different approach than a decade ago, when Chinese officials silenced reporting as a deadly pneumonia later known as SARS killed dozens in the south. (AP Photo/Eugene Hoshiko)

A worker carries a cage to catch pigeons at the People's Square as a precautionary measure against bird flu in Shanghai on Saturday April 6, 2013. Shanghai has reported two more cases of human infection of a new strain of bird flu, raising the number of cases in eastern China to 20. Six of the people who contracted the virus have died. (AP Photo) CHINA OUT

In this April 3, 2013 photo, workers disinfect at Sanguantang live poultry wholesale market in Shanghai, China. After a new and lethal strain of bird flu emerged in Shanghai two weeks ago, the government of China's bustling financial capital responded with live updates on a Twitter-like microblog. It's a starkly different approach than a decade ago, when Chinese officials silenced reporting as a deadly pneumonia later known as SARS killed dozens in the south. (AP Photo/Eugene Hoshiko)

Chinese health workers, wearing masks, walk past a group of security guards blocking a petitioner outside China's Health Ministry where a joint press conference between Chinese health officials and World Health Organization representatives was held in Beijing, China, Monday, April 8, 2013. The World Health Organization is talking with the Chinese government about sending international experts to China to help investigate a new bird flu strain that has killed six. Most of the 21 people stricken so far got severely ill. (AP Photo/Ng Han Guan)

Chinese health workers, wearing masks, walk past a group of security guards blocking a petitioner outside China's Health Ministry where a joint press conference between Chinese health officials and World Health Organization representatives was held in Beijing, China, Monday, April 8, 2013. The World Health Organization is talking with the Chinese government about sending international experts to China to help investigate a new bird flu strain that has killed six. Most of the 21 people stricken so far got severely ill. (AP Photo/Ng Han Guan)

Workers in protective clothing chat during a culling operation as authorities detected the new bird flu strain in pigeons being sold for meat at a wholesale market in Shanghai on Friday April 5, 2013. China announced a sixth death from a new bird flu strain Friday, while authorities carried out the slaughter of all poultry at a Shanghai market where the virus was detected in pigeons being sold for meat. (AP Photo) CHINA OUT

In this April 3, 2013 photo, a worker pushes a cart as live pigeons are sold at a cage at a poultry wholesale market in Shanghai China. China announced a sixth death from the new bird flu H7N9 strain Friday, while authorities in Shanghai halted the sale of live fowl and slaughtered all poultry at a market where the virus was detected in pigeons being sold for meat. The first cases were announced Sunday. (AP Photo/Eugene Hoshiko)

A worker catches a live chicken at a poultry market in Shanghai, China on Friday, April 5, 2013. China announced a sixth death from the new bird flu H7N9 strain Friday, while authorities in Shanghai halted the sale of live fowl and slaughtered all poultry at a market where the virus was detected in pigeons being sold for meat. The first cases were announced Sunday. (AP Photo)