Researchers are trying to figure out why some COVID-19 survivors suffer “brain fog” and other problems that can last for months.

And new findings suggest some concerning overlaps with Alzheimer’s disease.

One study of older adults in Argentina found a surprising amount of dementia-like changes in memory and thinking for at least six months after a bout with the new coronavirus, regardless of the severity of their infection.

Other researchers found Alzheimer’s-related proteins in the blood of New Yorkers whose COVID-19 infections triggered brain symptoms early on.

The preliminary findings were reported Thursday at an Alzheimer’s Association meeting.

Experts stress far more research is needed, and is getting underway, to tell if COVID-19 might raise the risk of Alzheimer’s or other brain problems later in life, or if people eventually recover.