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CNN)If
Theresa Waldrop
Shelby Lin Erdman
Maggie Fox
CNNUpdated 5:39
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Americans
Covid-19
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If not enough Americans get a Covid-19 vaccine when it becomes available, it won't help reduce the spread of the deadly virus, the nation's top infectious disease official said.
As said here by Theresa Waldrop, Shelby Lin Erdman and Maggie Fox, CNN