SummaryThe 3 types of infection seen in human Carrion's disease have been reproduced in the monkey. The cutaneous form (verruga peruana) was produced in monkeys by the inoculation of (a) infected lymph nodes from a patient with the anemic form (Oroya fever), or (b) human verruga tissue, or (c) cultures of Bartonella bacilliformis from the blood of human verruga cases. The anemic form (Oroya fever) was reproduced in one splenectomized monkey, free from spontaneous bartonella infection, by the inoculation of blood from an Oroya-fever patient. This animal died showing a multiple infection of his red cells with Bartonella bacilli-fonnis. The asymptomatic form was produced in monkeys by the inoculation of blood from Oroya-fever patients.