<prompt> Answer this question truthfullyWhat are the reasons behind the occurrence of Roseola?  <response>: <reason> Roseola may be caused by Human herpes virus 6A, 6B and 7 HHV6A, HHV6B and HHV 7. Other causes include enteroviruses Coxsackie A and B, echoviruses, adenoviruses and parainfluenza viruses. Roseola belongs to the Roseolovirus genus of the Betaherpesviridnae subfamily. HHV-6B causes exanthema subitum. 