<Tr> <Td_colspan="2"> <P> Human herpesvirus 7 (HHV - 7) </P> </Td> </Tr> <P> Human herpesvirus 7 (HHV - 7) </P> <P> Human herpesvirus 7 (HHV - 7) is one of nine known members of the Herpesviridae family that infects humans . HHV - 7 is a member of Betaherpesviridae, a subfamily of the Herpesviridae that also includes HHV - 6 and cytomegalovirus (HHV - 5 or HCMV). HHV - 7 often acts together with HHV - 6, and the viruses together are sometimes referred to by their genus, Roseolovirus . HHV - 7 was first isolated in 1990 from CD4+ T cells taken from peripheral blood lymphocytes . </P> <P> Both HHV - 6B and HHV - 7, as well as other viruses, can cause a skin condition in infants known as exanthema subitum, although HHV - 7 causes the disease less frequently than HHV - 6B . HHV - 7 infection also leads to or is associated with a number of other symptoms, including acute febrile respiratory disease, fever, rash, vomiting, diarrhea, low lymphocyte counts, and febrile seizures, though most often no symptoms present at all . </P>

Human herpesvirus (hhv) type 6 and type 7