Herpes viruses can cause infection in a range of mammals - dogs, horses, seals, sea lions, pigs, and primates - as well as humans.
especially the newly born, herpes viruses often are fatal. But in humans, only the Simian B type transmitted by Old World monkeys is known to cause death.
Nevertheless, the ease with which herpes viruses appear to transmit between species, and the role of the virus in non-infectious diseases, are a concern. In the mid-90s, a pet guinea pig
was diagnosed with human herpes simplex. In 1997, it was found that HHV-6 acted as a trigger in the onset
of multiple sclerosis.