COVID-19 variant XFG accounted for 0% of U.S. cases in May. By late-June, it became the third-most common strain.

New study reveals vitamin D supplements may reduce long COVID risk by 4%. Promising results for symptoms like fatigue and ...

Since the pandemic’s early days, many people have looked to vitamin D as a possible shield against the worst effects of COVID ...

While a randomized controlled trial of vitamin D 3 supplementation in COVID-19 patients didn’t yield a significant reduction ...

A sore throat that feels like swallowing glass—a.k.a. “razor-blade throat”—has become one of the most talked-about of the new COVID symptoms linked to Stratus, the strain of the virus driving new ...

Researchers are still trying to understand why some people develop Long COVID: lasting symptoms of the disease that can ...

New research finds metformin may not treat long COVID symptoms despite early promise. Learn what studies reveal about long COVID treatment and prevention.

The timing of symptom onset depends on lots of factors, including the amount of virus to which someone was exposed, Hotez says. Their level of pre-existing immunity may also affect the likelihood or ...