A new strain of COVID-19, XFG, is spreading rapidly across the world, including in the United States. Anecdotally, people who ...

COVID-19 symptoms were more commonly mild and limited to the upper respiratory tract among patients with vs without preexisting immunity at the time of infection, including when immunity was induced ...

COVID-19 patients may show symptoms such as breathlessness or delirium at the end of life. The goal of palliative medicine is to relieve such symptoms with specific treatments. Treatments can be drugs ...

A new COVID-19 variant named "Nimbus" has been detected in the U.S. and is spreading rapidly. Here's what to know about symptoms and vaccines.

A new COVID-19 variant that was unheard of just months ago is now projected to be the second-most common strain in the United States. Variant NB.1.8.1 was first detected in China in January but ...