sentences:  Distemper is caused by a single-stranded RNA virus of the family "Paramyxoviridae", which is a close relative of the viruses that cause measles in humans and rinderpest in animals.Geographically distinct lineages of the canine distemper virus are genetically diverse.This diversity arises from mutation, and when two genetically distinct viruses infect the same cell, from homologous recombination
  
  Distemper, or hardpad disease in canines, affects animals in the families Canidae (dog, fox, wolf, raccoon dog), Mustelidae (ferret, mink, skunk, wolverine, marten, badger, otter), Procyonidae (raccoon, coati), Ailuridae (red panda), Ursidae (bear), Elephantidae (Asian elephant), and some primates (e.g., Japanese monkey), as well as Viverridae (raccoon-like South Asian binturong, palm civet), Hyaenidae (hyena), Pinnipedia (seals, walrus, sea lion, etc.