Rinderpest is caused by

Rinderpest is caused by Viruses.
Rinderpest virus (RPV), a member of the genus Morbillivirus, is closely related to the measles and canine distemper viruses. The virus is particularly fragile and is quickly inactivated by heat, desiccation and sunlight.
It was an infectious viral disease of cattle, domestic buffalo, and many other species of even-toed ungulates, including gaurs, buffaloes, large antelope, deer, giraffes, wildebeests and warthogs.