As new variants of the virus spread, a race is on to vaccinate the public to protect against potentially more dangerous strains
As the coronavirus mutates and new, more contagious variants spread with alarming speed, the United States and the rest of the world are racing to vaccinate as many people as possible before potentially more dangerous strains emerge.
The overriding concern is that the continuing spread of COVID-19 — more than 1 million new infections every week in the United States alone — will allow the virus to evolve in more insidious ways that could defy the protections of existing vaccines, epidemiologists say.
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