SARS-CoV-2, the virus behind the Covid-19 pandemic, remains in the skull and meninges for years after infection, leading to a long-lasting effect on the brain, according to a major German study. 

Researchers from Helmholtz Munich and Ludwig-Maximilians-Universitat (LMU) found that SARS-CoV-2 spike protein remains in the brain's protective layers -- the meninges, and the skull's bone marrow for up to four years after infection.