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The makers of both of the only COVID-19 vaccines approved for use in the U.S. have announced that they are developing booster shots to improve protection against emerging strains of virus.
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A pharmacist in Grafton, Wisc., is accused of tampering with supplies of the Moderna vaccine in December. He faces a maximum of 10 years in prison and a $250,000 fine for each of two charges.
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President Joe Biden announced Tuesday his administration has secured commitments from vaccine makers to buy another 200 million doses to arrive this summer.
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As long as the virus continues to spread between people, it will continue to mutate, he warns.
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