In 1870 began the construction of the train between Lima-La Oroya. Several foreign workers were doing different labors of construction when a disease characterized by fever and anemia began to kill them. Thousands of workers died with the disease which received the name of Oroya’s fever.

In that time, other interesting disease: Peruvian wart attracted the attention of medical students and professors.

In 1885 Evaristo Chavez, was asked by Carrion to do an inoculation on him, from the secretion of a wart from a patient with Peruvian wart. After 21 days of the inoculation, he showed no sign of warts but he began to suffer the first symptoms of Oroya’s fever: fever and anemia. The October 5th of 1885 Carrion died. He claimed that both diseases had the sameorigin. In few years, Carrion was recognized like a martyr of peruvian medicine and the term Carrion’s disease was used until our times.