Marmosets. Common marmosets, cynomolgus and African green monkeys are susceptible to HHV-6 infection. CD46 transgenic mice are susceptible to HHV-6A but not HHV-6B (Reynaud 2014). Porcine cytomegalovirus or PCMV is closely related to HHV-6 and HHV-7 has recently been designated a roseolovirus closely related to HHV-6A/B. MTV or murine thymus virus is now known to be a roseolovirus and was renamed murine roseolovirus (MRV). David Mock at the University of Rochester has used murine oligodendroglial precursor cells and infects them with HHV-6 for a murine in vitro model. Margolis and Lusso at the NIH have studied HHV-6 in human lymphoid tissue ex vivo.