While long-term COVID can cause brain fog, erectile dysfunction and hair loss, experts say the novel coronavirus could contribute to another harrowing health condition: deadly brain disease. Doctors from the Department of Internal Medicine at Mount Sinai Queens believe COVID was "highly likely" a contributing factor to a New York City man developing fatal prion disease. Two months before he was admitted to the hospital, the 62-year-old Queens local started to drool and move at a slower pace, the doctors wrote in an article published Thursday by the American Journal of Case Reports.