[Disseminated nontuberculous mycobacterial infections in AIDS patients].

Disseminated nontuberculous mycobacteriosis is a frequent and late complication of HIV infection. All the 13 patients described here had CD4-lymphocyte counts < 20/mm3. The causative agent was mainly M. avium complex. But we also found, for the first time, a double infection with M. avium complex and M. "genavense" and one patient with growth of M. shimoidei in the blood culture. Clinical signs are nonspecific (fever, reduced performance, anemia). Positive cultures of blood or tissue biopsies are diagnostic. The therapeutic approach is the combination of new macrolides with other antimycobacterial agents. Prognosis is poor, mainly due to advanced immunodeficiency, but two of our patients survived more than one year after diagnosis. Prophylactic treatment should be considered in patients with CD4-counts less than 50/mm3.