Scientists are exploring many avenues to find out what underpins long-haul COVID. The diverse, often debilitating sets of symptoms are already affecting many, possibly millions, of people around the world.
TwilightEye/Getty
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.