More than a dozen states will open vaccine eligibility to all adults this week in a major expansion of COVID-19 shots for tens of millions of Americans amid a worrisome increase in virus cases and concerns about balancing supply and demand for the vaccines.

Meanwhile, the director of the Centers for Disease Control and Prevention said Monday that she had a recurring feeling of "impending doom" about a potential fourth wave of infections after cases in the U.S. rose 10% over the last week. She pleaded with Americans not to relax preventative practices such as social distancing and mask-wearing

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