A healthcare worker administers the vaccine as the Empire State Building Offers COVID-19 vaccines at its Observatory in New York City.
Mandatory Credit: Monica Schipper/Getty Images
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Unvaccinated Americans are at risk of an aggressive and more dangerous Covid-19 variant. These are the most vulnerable states
Some states are making great strides in vaccinating their residents against Covid-19, but the ones that are not may soon be contending with a more transmissible variant, experts say.
