Health officials are releasing the first nationally representative estimate of how many U.S. adults have chronic fatigue syndrome: 3.3 million.

Research in U.S. veterans provides fresh evidence that long COVID-19 can happen even after breakthrough infections following vaccination.

President Joe Biden is ordering a new national research push on long COVID, while also directing federal agencies to support patients dealing with the mysterious and debilitating condition.

Experts say it's too early to know whether people infected with the omicron variant will develop long COVID.

Omicron's race across the globe has amped up concerns about long COVID, which some estimates suggest affects a third of COVID-19 survivors.

People who have survived Covid 19 now facing severe after effects of the virus. Serious and debilitating illness that is lasting months and may last longer.

The east London district of Ilford sits in an area dubbed the “COVID triangle,” three outer London boroughs that have had some of Britain’s highest coronavirus infection rates.