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Delta variant: 6 things to know about the highly contagious coronavirus strain

After declining sharply for months, COVID-19 cases are climbing in the U.S. once again as a result of the Delta variant, which some experts have called “the most troubling variant by far.” Yahoo News medical Contributor Dr. Kavita Patel, a primary care physician in Washington, D.C., explains what we've learned so far about the fast-spreading strain, and how to protect yourself and loved ones from it.

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