Increased phosphorylated tau (pTau-181) is associated with neurological post-acute sequelae of coronavirus disease in essential workers: a cohort study https://www.thelancet.com/journals/ebiom/article/PIIS2352-3964(25)00556-0/fulltext Increased levels of Alzheimer's-linked protein found in some with long COVID https://medicalxpress.com/news/2026-01-alzheimer-linked-protein-covid.html