<unk>  <unk>  (from the Greek cyto-, "cell", and -mega-, "large") is a viral genus of the Herpesviruses group.<unk>  belongs to the Betaherpesvirinae subfamily of Herpesviridae, which also includes Roseolovirus, also known as Human Herpes Virus 6 (HHV-6).  The Alphaherpesvirinae contains herpes simplex virus types 1 and 2, and varicella-zoster virus (which causes chickenpox and shingles).  The Epstein-Barr virus  belongs to the Gammaherpesvirinae subfamily.  The herpesviruses share a characteristic ability to remain latent within the body over long periods.<unk>  infections are frequently associated with salivary glands, though they may be found throughout the body.<unk>  infection can also be life threatening for patients who are immunocompromised (e.g. patients with HIV, organ transplant recipients, or neonates).<unk>  viruses are found in many mammal species, but<unk>  species isolated from animals differ from human<unk>  in terms of genomic structure, and have not been reported to cause human disease.
In humans,<unk>  is found throughout all geographic locations and socioeconomic groups, and infects between 50% and 80% of adults in the United States as indicated by the presence of antibodies in much of the general population. <unk>  is also the virus most frequently transmitted to a developing child before birth.<unk>  infection is more widespread in developing countries and in areas of lower socioeconomic conditions and causes the most birth defects in industrialized countries of all the herpes viruses.
Cytomegalovirus
Human papillomavirus
Epstein Barr virus
Varicella zoster virus
Herpes simplex virus
Rubella virus
Hepatitis B virus
Smallpox virus