Cytomegalovirus is a virus of the herpes virus family. It is also for convenience called CMV. It is a virus usually responsible for few symptoms in people whose immune system is efficient, responsible for fatigue or other minor symptoms such as pain or fever, but it can be serious in immunocompromised individuals or pregnant women. It is common in people with HIV in the advanced stages of the disease and should be treated with antivirals. The risk in pregnant women is harm to the fetus including growth retardation, mental retardation, and neurological signs for the unborn child.