What is a COVID-19 vaccine 'breakthrough' case? What should you know about the delta variant? Get answers to questions here.
Vaccination rates are rising in some states where new COVID-19 cases are soaring. Get the latest on the delta variant, rare "breakthrough" cases, and find answers to 5 key questions about the persisting pandemic.
Country star Reba McEntire is telling people to continue to mask up and quarantine, saying she and her boyfriend contracted COVID-19 despite being vaccinated.
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