A chronic gut infection caused by a common virus may be linked to the progression of Alzheimer ’s disease, a new study has found. Cytomegalovirus, or HCMV, is one of nine herpes viruses that most people are exposed to in the first few decades of life. Unlike most herpes viruses, however, it is not considered to be sexually transmitted.

Researchers discovered a connection between Alzheimer’s disease and herpes simplex virus-1 (HSV-1), suggesting viral infections may contribute to neurodegeneration.

A new study found a link between cytomegalovirus (CMV) and Alzheimer's disease. Here's what a neurologist wants you to know, plus how to protect yourself.