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SAN DIEGO — From South Africa to Brazil to California, the list of locations linked to new strains of the coronavirus is growing — and so are concerns that viral variants could undo the vaccine rollout.
The worries come at a time when most Americans still haven’t received a COVID-19 vaccine. That could change by the end of May, when President Joe Biden says there will be enough vaccine for all adults in the U.S. But by then, new and faster-spreading coronavirus strains will likely account for nearly all cases.KEEP READING
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