The identification of human herpesvirus (HHV) 6 (HHV-6) and 7 (HHV-7) was first reported in 1986 and 1990, respectively. HHV-6 was isolated initially from the blood of several immunodeficient adults, including some with acquired immunodeficiency syndrome (AIDS) (1). The existence of HHV-7 was first revealed in the blood of a healthy, human immunodeficiency virus (HIV)-negative adult (2). Extens...
