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Chinese residents, some wearing masks, pass by a coronavirus vaccination center in Beijing Friday, April 9, 2021. In a rare admission of the weakness of Chinese coronavirus vaccines, the country's top disease control official says their effectiveness is low and the government is considering mixing them to give them a boost. (AP Photo/Ng Han Guan)

Chinese residents, some wearing masks, pass by a coronavirus vaccination center in Beijing Friday, April 9, 2021. In a rare admission of the weakness of Chinese coronavirus vaccines, the country's top disease control official says their effectiveness is low and the government is considering mixing them to give them a boost. (AP Photo/Ng Han Guan)

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