A new COVID-19 variant is climbing the ranks in the United States, becoming the third-most common strain of the summer. Variant XFG, colloquially known as "Stratus," was first detected in Southeast ...

A fourth dose of bivalent or monovalent BA.1-adapted BNT162b2 vaccines was safe and elicited robust neutralizing responses in adults aged 18 to 55 years.

A few days later, he tested positive for COVID-19 – an illness he says he still hasn’t fully recovered from five years later. “I still feel like there’s phlegm stuck in my lungs,” Muñoz said in ...