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 have discovered a link between a chronic gut infection caused by a common virus and the development of Alzheimer's disease in some people. Most people encounter cytomegalovirus (CMV) during childhood, and after the initial infection the virus remains in the body for life, usually dormant.

The researchers found the presence of CMV antibodies all over patients with Alzheimer's disease, including the intestines, spinal fluid, brains, and vagus nerves. The scientists found similar findings in an independent group of patients with Alzheimer’s disease.

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.