There is little information on the presence of the Mycobacterium avium-Intracellulare (MAC) complex in Peru. Five cases of MAC infection are described in patients with HIV/AIDS at the National Hospital Dos de Mayo, Lima – Peru. The patients presented, mainly, persistent fever, chronic diarrhea, consumptive syndrome, pancytopenia and citofagocitosis. In all of them, resistant acid-alcohol bacilli were identified in feces, so they received antituberculous treatment. The culture of feces was negative for Mycobacterium tuberculosis and, later, in all cases MAC was identified using a molecular test (genotype) in the culture of feces. Three patients received treatment for MAC right after identification; however, they all died. Before presentations similar to the reported, we suggest the use of higher performance methods (blood culture, myeloculture, molecular tests), as well as early associating drugs with activity for MAC to antitubercular scheme with the intention of improving the prognosis of this group of patients.