Cytomegalovirus (CMV) is a common virus that belongs to the herpesvirus family. It usually causes mild or symptom-free infections in healthy individuals but can lead to more serious complications in people with weakened immune systems, such as newborns, transplant recipients, and those with HIV or AIDS. CMV is spread through close contact with bodily fluids, including saliva, urine, blood, and breast milk, as well as through organ transplantation and blood transfusions. Symptoms of CMV infection may include fever, fatigue, sore throat, swollen glands, and muscle aches, though many people may not experience any symptoms at all. Pregnant women can pass CMV to their unborn babies, potentially causing health problems or other issues. Treatment for CMV infection depends on the seriousness of symptoms and the individual's health condition, but antiviral medications may be prescribed in certain cases.