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FILE - In this Jan. 15, 2021 file photo, a healthcare worker prepares a dose of China's Sinovac Biotech experimental vaccine for the new coronavirus to inject into a volunteer during the testing stage at the University Hospital of Brasilia, Brazil. The government has yet to approve a single vaccine, and Health Ministry officials have ignored outside experts’ advice. (AP Photo/Eraldo Peres, File)

FILE - In this Jan. 15, 2021 file photo, a healthcare worker prepares a dose of China's Sinovac Biotech experimental vaccine for the new coronavirus to inject into a volunteer during the testing stage at the University Hospital of Brasilia, Brazil. The government has yet to approve a single vaccine, and Health Ministry officials have ignored outside experts’ advice. (AP Photo/Eraldo Peres, File)

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