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A public park staff carries a cage to catch pigeons with at a public area in People Square, downtown Shanghai April 6, 2013. Health authorities in China said on Saturday that the country's 16 confirmed H7N9 bird flu cases were isolated and showed no sign that it is transmitted from human to human, Xinhua News Agency reported. Shanghai municipal government has ordered workers to remove pigeons from public area to prevent the spread of H7N9 bird flu to humans, local media reported. REUTERS/Aly Song ( HEALTH-BIRDFLU/ )

Technical staff from the animal disease prevention and control center inject chickens with the H5N1 bird flu vaccine in Shangsi county, Guangxi Zhuang autonomous region, April 3, 2013. A total of 10 people in China have been confirmed to have contracted H7N9, all in the east of the country. The latest was a 64-year-old man from Huzhou in the eastern province of Zhejiang, who state media said on Thursday was admitted to hospital on March 31. Picture taken April 3, 2013. REUTERS/China Daily ( HEALTH-BIRDFLU/CHINA )

Xu Jianguang, director-general and deputy secretary of the Communist Party of China Committee of Shanghai Municipal Health Bureau, speaks as Wu Fan, left, chief doctor and director-general of Shanghai Municipal Center for Disease Control, and Agricultural Committee Deputy Director Shao Linchu, right, listen during a press conference in Shanghai, China, 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/Eugene Hoshiko) ( China Bird Flu )

Taiwan's Health Minister Chiu Wen-ta is seen on a video camera screen as he talks to reporters during an inspection of preparations for the H7N9 virus in Taipei City Hospital Heping Branch, April 6, 2013. The new strain of bird flu has infected 16 people in China, all in the east of the country. Six people have died, and the outbreak has spread concern overseas and sparked a sell-off in airline shares in Europe and Hong Kong. REUTERS/Pichi Chuang ( HEALTH-BIRDFLU )

A nurse (R) introduces the front desk for the negative pressure isolation rooms section, which will be used to treat potential H7N9 avian influenza patients, at Taipei Hoping Hospital on April 6, 2013. Taiwan enhanced its level of alert against bird flu and set up a contingency centre on April 3 after reports in mainland China of new infections from a new strain of avian influenza. The new infections alarmed the authorities in Taiwan, which is separated from the Chinese mainland only by a 180-kilometre (111.6 miles) strait and which has seen a dramatic influx of 2.6 million Chinese visitors last year due to the fast warming ties between Taipei and Beijing. SAM YEH/AFP/Getty Images ( 518680931 )

A patient with fever (R) is accompanied by a family member while receiving treatment at the hospital where a 67-year-old H7N9 patient is being treated, in Hangzhou, Zhejiang province, April 3, 2013. China said it was mobilising resources nationwide to combat a new strain of deadly bird flu that has killed three people, as Japan and Hong Kong stepped up vigilance against the virus and Vietnam banned imports of Chinese poultry. A total of 10 people in China have been confirmed to have contracted H7N9, all in the east of the country. The latest was a 64-year-old man from Huzhou in the eastern province of Zhejiang, who state media said on Thursday was admitted to hospital on March 31. Picture taken April 3, 2013. REUTERS/Chance Chan ( HEALTH-BIRDFLU/CHINA )

Doctors and nurses attend a training course for treatment of H7N9 virus at a hospital, where a H7N9 patient is being treated, in Hangzhou, Zhejiang province, April 5, 2013. The new strain of bird flu has infected 16 people in China, all in the east of the country. Six people have died, and the outbreak has spread concern overseas and sparked a sell-off in airline shares in Europe and Hong Kong. Picture taken April 5, 2013. REUTERS/Chance Chan ( HEALTH-BIRDFLU/ )

A doctor waits for a blood sample outside an isolation ward where a 67-year-old patient suffering from the H7N9 bird flu strain is being treated at a hospital in Hangzhou, Zhejiang province, April 4, 2013. China said it was mobilising resources nationwide to combat the new strain of the deadly bird flu that has killed four people, as Japan and Hong Kong stepped up vigilance against the virus and Vietnam banned imports of Chinese poultry. A total of 11 people in China have been confirmed to have contracted H7N9, all in the east of the country, while another person died on Thursday, in Shanghai, bringing the number of deaths to four, state media said. Authorities in Shanghai also discovered the H7N9 virus in a pigeon sample taken from a traditional wholesale market, Xinhua added, believed to be the first time the virus has been discovered in a animal in China since the outbreak began. REUTERS/Chance Chan ( HEALTH-BIRDFLU/CHINA )

Technicians carry out a test for the H7N9 bird flu virus using test reagents at the Beijing Center for Diseases Control and Prevention in Beijing April 3, 2013. Test reagents for the H7N9 virus arrived in Beijing on Tuesday enabling the city's diseases control and prevention centre, and 55 laboratories in its network, to test for the virus. Chinese authorities reported four new cases on Tuesday of a strain of bird flu previously unknown in humans that has already killed two people, taking the total of known cases to seven. REUTERS/Stringer ( HEALTH-BIRDFLU/CHINA )

A chicken is seen at a yard in central Beijing, April 5, 2013. All of the 14 reported infections from the H7N9 bird flu strain have been in eastern China and at least four of the dead are in Shanghai, a city of 23 million people and the showpiece of China's vibrant economy. REUTERS/Jason Lee ( HEALTH-BIRDFLU/ )

A vendor packs his chickens at a poultry market in Nanjing, Jiangsu province, April 5, 2013. Health authorities in China said on Saturday that the country's 16 confirmed H7N9 bird flu cases were isolated and showed no sign that it is transmitted from human to human, Xinhua News Agency reported. Picture taken April 5, 2013. REUTERS/China Daily ( HEALTH-BIRDFLU/ )

A worker spays disinfectant liquid on to chicken cages at a wholesale market on Thursday, April 4, 2013, in Shanghai, China. In a worrisome sign, a bird flu in China appears to have mutated so that it can spread to other animals, raising the potential for a bigger threat to people, scientists said Wednesday. (AP Photo) ( China Bird Flu )

Technicians wearing protection suits begin to cull poultry at Huhuai poultry wholesale market, where the H7N9 bird flu virus was detected in pigeon samples, in Shanghai April 5, 2013. Chinese authorities were slaughtering birds at this poultry market in the financial hub Shanghai as the death toll from a new strain of bird flu mounted to six on Friday, spreading concern overseas and sparking a sell-off on Hong Kong's share market. State news agency Xinhua said the Huhuai market for live birds in Shanghai had been shut down and birds were being culled after authorities detected the H7N9 virus from samples of pigeons in the market. According to Xinhua News Agency, east China's Zhejiang Province on Friday morning reported that a man has died from the H7N9 bird flu, bringing the death toll from the new deadly strain to six in the country. REUTERS/Stringer ( HEALTH-BIRDFLU/ )

An employee wearing a protection suit sprays disinfectant on chickens at a poultry market in Hefei, Anhui province April 5, 2013. Chinese authorities were slaughtering birds at a poultry market in the financial hub Shanghai as the death toll from a new strain of bird flu mounted to six on Friday, spreading concern overseas and sparking a sell-off on Hong Kong's share market. According to Xinhua News Agency, east China's Zhejiang Province on Friday morning reported that a man has died from the H7N9 bird flu, bringing the death toll from the new deadly strain to six in the country. REUTERS/Stringer ( HEALTH-BIRDFLU/ )

Technicians wearing protection suits begin to cull poultry at a poultry wholesale market, where H7N9 bird flu virus was detected in pigeon samples, in Shanghai, April 5, 2013. China said it was mobilising resources nationwide to combat a new strain of bird flu that has killed six people, as Japan and Hong Kong stepped up vigilance and the United States said it was closely monitoring the situation. All of the 14 reported infections from the H7N9 bird flu strain have been in eastern China and at least four of the six dead are in the financial hub of Shanghai, a city of 20 million people. REUTERS/Stringer ( HEALTH-BIRDFLU/ )

Chickens are pictured on the floor of a food market in downtown Shanghai, April 5, 2013. Chinese authorities slaughtered over 20,000 birds at a poultry market in Shanghai on Friday as the death toll from a new strain of bird flu mounted to six, spreading concern overseas and sparking a sell-off in airline shares in Europe and Hong Kong. All the 14 reported infections from the H7N9 bird flu strain have been in eastern China and at least four of the dead are in Shanghai. REUTERS/Carlos Barria ( HEALTH-BIRDFLU/ )

A masked security guard stand outside Taipei Hoping Hospital on April 6, 2013 where new isolation units have been set up to treat potential new H7N9 avian influenza cases. Taiwan enhanced its level of alert against bird flu and set up a contingency centre on April 3 after reports in mainland China of new infections from a new strain of avian influenza. The new infections alarmed the authorities in Taiwan, which is separated from the Chinese mainland only by a 180-kilometre (111.6 miles) strait and which has seen a dramatic influx of 2.6 million Chinese visitors last year due to the fast warming ties between Taipei and Beijing. SAM YEH/AFP/Getty Images ( 518680955 )

Doves rest on a tree at a park in Shanghai April 5, 2013. All of the 14 reported infections from the H7N9 bird flu strain have been in eastern China and at least four of the dead are in Shanghai, a city of 23 million people and the showpiece of China's vibrant economy. REUTERS/Aly Song ( HEALTH-BIRDFLU/ )

People feed pigeons at a park in Nanjing, Jiangsu province, April 5, 2013. Health authorities in China said on Saturday that the country's 16 confirmed H7N9 bird flu cases were isolated and showed no sign that it is transmitted from human to human, Xinhua News Agency reported. Picture taken April 5, 2013. REUTERS/China Daily ( HEALTH-BIRDFLU/ )

A public park staff catches a dove at a public area in People Square, downtown Shanghai April 6, 2013. Health authorities in China said on Saturday that the country's 16 confirmed H7N9 bird flu cases were isolated and showed no sign that it is transmitted from human to human, Xinhua News Agency reported. Shanghai municipal government has ordered workers to remove pigeons from public area to prevent the spread of H7N9 bird flu to humans, local media reported. REUTERS/Aly Song ( HEALTH-BIRDFLU/ )

A boy looks at pigeons at a public park in People Square, downtown Shanghai April 6, 2013. Health authorities in China said on Saturday that the country's 16 confirmed H7N9 bird flu cases were isolated and showed no sign that it is transmitted from human to human, Xinhua News Agency reported. Shanghai municipal government has ordered workers to remove pigeons from public area to prevent the spread of H7N9 bird flu to humans, local media reported. REUTERS/Aly Song ( HEALTH-BIRDFLU/ )

A woman walks in the rain past the front of Taipei Hoping Hospital on April 6, 2013 which contains 191 negative pressure isolation units set up to treat potential new H7N9 avian influenza cases. Taiwan enhanced its level of alert against bird flu and set up a contingency centre on April 3 after reports in mainland China of new infections from a new strain of avian influenza. The new infections alarmed the authorities in Taiwan, which is separated from the Chinese mainland only by a 180-kilometre (111.6 miles) strait and which has seen a dramatic influx of 2.6 million Chinese visitors last year due to the fast warming ties between Taipei and Beijing. SAM YEH/AFP/Getty Images ( 518680930 )

A woman and her daughter stand in front of a closed butcher stall at a local market in Minhang district, south of Shanghai April 3, 2013. According to vendors in the area, the stall belongs to a 27 year-old man who died last month after contracting a strain of avian influenza that had never been passed to humans before. China reported four new cases on Tuesday of a strain of bird flu that was previously unknown in humans but has already killed two people, raising the total of known cases to seven. The World Health Organisation (WHO) said on Monday there was no evidence that the H7N9 strain could be transmitted between people, but that it was investigating the outbreak. The four new patients in China's eastern Jiangsu province were all in critical condition and receiving emergency treatment, the Xinhua News Agency said, citing the Jiangsu provincial health bureau. A woman in Anhui province who caught the virus in early March is also in critical condition. REUTERS/Carlos Barria ( HEALTH-BIRDFLU-CHINA )

A child with the flu receives treatment at a hospital in Hefei, Anhui province April 5, 2013. Chinese authorities were slaughtering birds at a poultry market in the financial hub Shanghai as the death toll from a new strain of bird flu mounted to six on Friday, spreading concern overseas and sparking a sell-off on Hong Kong's share market. According to Xinhua News Agency, east China's Zhejiang Province on Friday morning reported that a man has died from the H7N9 bird flu, bringing the death toll from the new deadly strain to six in the country. REUTERS/Stringer ( HEALTH-BIRDFLU/ )

A vender stands near chicken cages at a chicken whole sale market on Tuesday April 2, 2013 in Shanghai, China. China's financial capital, Shanghai, on Tuesday activated an emergency response plan following the recent deaths of two men from a lesser-known strain of bird flu. (AP Photo) ( China Bird Flu )

A Chinese policeman wears a mask as he guards an access to a wholesale market where authorities are culling poultry after the new bird flu strain was detected there in pigeons being sold for meat 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 Bird Flu )

Inspectors from the city's commercial and industry bureau review a chicken wholesale market on Wednesday, April 3, 2013, in Shanghai, China. Scientists taking a first look at the genetics of the bird flu strain that recently killed two men in China said Wednesday the virus could be harder to track than its better-known cousin H5N1 because it might be able to spread silently among poultry without notice. The virus also appears to have mutated into a form that enables it to more easily infect animals such as pigs, meaning they could serve as hosts that spread the virus more widely among humans. (AP Photo/Eugene Hoshiko) ( China Bird Flu )

A vendor smokes next to his pigeons at a poultry market after the market was asked to be closed from Saturday onwards, in Wuhan, Hubei province, April 5, 2013. The new strain of bird flu has infected 16 people in China, all in the east of the country. Six people have died, and the outbreak has spread concern overseas and sparked a sell-off in airline shares in Europe and Hong Kong. Picture taken April 5, 2013. REUTERS/Stringer ( HEALTH-BIRDFLU/ )

A woman wears a face mask inside a subway station in Shanghai, April 5, 2013. Chinese authorities were slaughtering birds at a poultry market in the financial hub Shanghai as the death toll from a new strain of bird flu mounted to six on Friday, spreading concern overseas and sparking a sell-off on Hong Kong's share market. State news agency Xinhua said the Huhuai market for live birds in Shanghai had been shut down and birds were being culled after authorities detected the H7N9 virus from samples of pigeons in the market. All of the 14 reported infections from the H7N9 bird flu strain have been in eastern China and at least four of the dead are in Shanghai, a city of 23 million people and the showpiece of China's vibrant economy. REUTERS/Carlos Barria ( HEALTH-BIRDFLU/ )

An elderly woman looks at a cokerel in Beijing on April 4,2013. A man in the Chinese province of Zhejiang has died of the H7N9 strain of bird flu, state media said on March 3, bringing the total deaths attributed to the virus to three since the first human cases. WANG ZHAO/AFP/Getty Images ( 518639112 )