Mu COVID Variant: Here's Everything You Need To Know

Where is it spreading? How does it compare to delta? Read this if you're concerned about the new coronavirus strain.

The highly contagious delta variant has utterly transformed the COVID-19 pandemic. It’s also a major reason why the United States reached a grim new milestone this week: There are now more than 40 million known coronavirus cases, according to The New York Times. But delta isn’t the only variant officials are keeping an eye on. There has been an interest recently in the “mu” variant — also known as B.1.621 — which is steadily increasing in certain parts of the world, and has been identified here in the U.S. in 49 states. Here’s what you need to know.