Carrion’s disease is an infectious disease caused by a microorganism of the genus Bartonella.

Two species have been described, the bacilliformis type and the Verrugiformis type. These bacteria are parasites of human red blood and histiocytic cells. The ba­cilliformis type produces two stages of the disease, a febrile acute hemolytic anemia known as “Oroya fever,” followed by a granulomatous mucocutaneous eruption known as “Verruga Peruana.” The υerrugi- formis type produces only the verrucose stage.