The contacts between man and nonhuman primates enable the transmission of mic roorganisms from one species to the other. Such contact may occur at quite differ ent levels: man and nonhuman primates may share the same ecosystem including the presence of vectors in the countries of origins of monkeys and apes; the animals are captured to be sold or used for food; field researchers have to stay near the ani mals in the wild; an uncontrolled human population gets close enough to almost touch the animals in zoological gardens around the world; pet owners establish bodily contact and finally...