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Patent Pending Cytomegalovirus (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.