Mycobacterium avium


TAXONOMY: Actinobacteria -> Actinobacteria -> Corynebacteriales -> Mycobacteriaceae -> Mycobacterium -> Mycobacterium avium complex (MAC) -> Mycobacterium avium


Mycobacterium avium complex (MAC), also called Mycobacterium avium-intracellulare complex, is a microbial complex of 2 Mycobacterium species, Mycobacterium avium and Mycobacterium intracellulare. It causes Mycobacterium avium-intracellulare infection. Some sources also include Mycobacterium avium subspecies paratuberculosis (MAP). Mycobacterium avium complex (MAC) include ubiquitous atypical bacterium found in the environment which can infect patients with HIV and low CD4 cell count (below 100/microliter); mode of infection is usually inhalation or ingestion. MAC causes disseminated disease in up to 40% of patients with human immunodeficiency virus (HIV) in the United States, producing fever, sweats, weight loss, and anemia. Disseminated MAC characteristically affects patients with advanced HIV disease and peripheral CD4+ T-lymphocyte counts less than 100 cells/uL. Effective prevention and therapy of MAC has the potential to contribute substantially to improved quality of life and duration of survival for HIV-infected persons.

This species has been identified as a resident in the human gastrointestinal tract based on the phylogenetic framework of its small subunit ribosomal RNA gene sequences.[PMC 4262072]

Gut associated