Cytomegalovirus (CMV) is a common virus that belongs to the herpesvirus family. It can infect people of all ages and is usually harmless in healthy individuals. Most people may not even know they have it, as symptoms are often mild or absent. However, CMV can cause serious health issues in people with weakened immune systems and in newborns. CMV is primarily spread through bodily fluids, such as saliva, urine, and blood. Once infected, the virus remains in the body for life, often lying dormant. In some cases, it can reactivate, especially in individuals with compromised immune systems, leading to complications like pneumonia or vision problems.