Health experts say extraordinary measures against swine flu -- most notably quarantines imposed by China, where entire planeloads of passengers were isolated if one traveler had symptoms -- have failed to contain the disease.
Despite initially declaring success, Beijing now acknowledges its swine flu outbreak is much larger than official numbers show.
China's official count of some 63,000 reported illnesses with 53 deaths dwarfs estimates of millions of cases with nearly 4,000 deaths in the United States, a nation with about a third of China's population.
Dr. Michael O'Leary, WHO's top representative in China, says there has been a dramatic spike in Chinese swine flu cases recently and those reported by the government are only "minimum numbers."
"We have new cases occurring all the time," he told The Associated Press last week. "There's always more deaths than we could possibly know about."
He said there is little data to prove interventions like mass quarantines and school closures slow down disease transmission. "To draw a causal link ... is not always possible," O'Leary said, adding that WHO expected a disease as contagious as swine flu to spread regardless of what measures countries impose.
China's Health Minister Chen Zhu defended his country's aggressive quarantine policy, telling the AP on Wednesday that the measures helped slow the spread of the virus long enough for China to develop a vaccine, which authorities are now scrambling to administer.
"With initial efforts of containment, actually we not only reduced the impact of the first wave to China, but we also won time for us to prepare the vaccine," Chen said in an interview on the sidelines of a meeting of the Global Forum for Health Research in Havana.
He said China was vaccinating 1.5 million people a day against swine flu as part of a massive effort to try to reach as many as 90 million people -- about 7 percent of the country's population -- by the end of the year.
"We know this is not enough for a population of 1.3 billion, but at least for the vulnerable people, for the students, people with underlying basic diseases and ... for pregnant women, we have vaccines," Chen said.
China has acknowledged swine flu is now widespread despite its aggressive attempts at containment.
Earlier this month, Feng Zijian, head of China's Center for Disease Control and Prevention, said the country's reported figures are only "a very small portion" of the total number of cases. (continued...)
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