<unk>  (from the Greek cyto-, "cell", and megalo-, "large") is a genus of viruses in the order Herpesvirales, in the family Herpesviridae, in the subfamily Betaherpesvirinae. Human and  monkeys serve as natural hosts. There are currently eight species in this genus including the type species human herpesvirus 5. Diseases associated with  HHV-5 include mononucleosis, and pneumonias. It is typically abbreviated as<unk> .
The species that infects humans is commonly known as human<unk>  (HCMV) or human herpesvirus-5 (HHV-5), and is the most studied of all<unk> es. Within Herpesviridae,<unk>  belongs to the Betaherpesvirinae subfamily, which also includes the genera Muromegalovirus and Roseolovirus (HHV-6 and HHV-7). It is related to other herpesviruses within the subfamilies of Alphaherpesvirinae that includes herpes simplex viruses (HSV)-1 and -2 and varicella-zoster virus (VZV), and the Gammaherpesvirinae subfamily that includes Epstein–Barr virus.
All herpesviruses share a characteristic ability to remain latent within the body over long periods. Although they may be found throughout the body,<unk>  infections are frequently associated with the salivary glands in humans and other mammals. Other<unk>  viruses are found in several mammal species, but species isolated from animals differ from HCMV in terms of genomic structure, and have not been reported to cause human disease.
Cytomegalovirus
Human papillomavirus
Epstein Barr virus
Varicella zoster virus
Herpes simplex virus
Rubella virus
Hepatitis B virus
Smallpox virus