2nd virus vaccine shows overwhelming success in U.S. tests

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Moderna said its vaccine appears to be 94.5% effective, according to preliminary data. A week ago, competitor Pfizer announced its own COVID-19 vaccine appeared similarly effective—news that puts both companies on track to seek permission within weeks for emergency use in the U.S.

Moderna said its vaccine appears to be 94.5% effective, according to preliminary data. A week ago, competitor Pfizer announced its own COVID-19 vaccine appeared similarly effective—news that puts both companies on track to seek permission within weeks for emergency use in the U.S.

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