Newcomer Supply Cytomegalovirus (CMV) Control Slides are for the positive immunohistochemical staining of cytomegalovirus, a member of the herpes virus group, including herpes simplex virus types 1 and 2, varicella zoster virus, and Epstein Barr virus. Cytomegalovirus (CMV) Control Slides contain sections of positive staining lung and negative staining myometrium.