Non-tuberculous mycobacterial infection

Non-tuberculous mycobacterial infection is defined as disease resulting from exposure to nontuberculous mycobacteria—distinct from *Mycobacterium tuberculosis*—and includes infections caused by species such as *M. avium* and *M. intracellulare*, collectively termed the Mycobacterium avium complex (MAC). These organisms are environmental saprophytes found in soil, water, and household plumbing systems. The infection is classified as atypical because it does not follow the typical epidemiology or pathology of tuberculosis. As a bacterial disease, NTM infection is recognized in public health surveillance frameworks such as NINDSS, though no specific ICD-10 or ICD-11 codes are provided in the source material.

The most commonly reported clinical manifestation is respiratory illness, often presenting initially as a persistent cough. In immunocompromised populations—including those with advanced HIV/AIDS—the disease may progress to severe pulmonary involvement. While the source describes MAC infection specifically, it notes that the syndrome is generally more severe in late-stage AIDS. No details on disease course, duration, or complications beyond respiratory presentation are provided in the available snippets. No information on pediatric or adult-specific severity patterns, mortality, or extrapulmonary manifestations is included in the source text.

NTM infection is geographically widespread, with environmental reservoirs in soil and water sources globally. The source indicates that MAC infection occurs in humans, birds, and pigs, suggesting zoonotic potential but no evidence of human-to-human transmission. Epidemiological data on incidence, prevalence, or regional variation are not provided in the source snippets. Surveillance burden and population-level risk factors remain unquantified in the available materials. The only cited study is a 15-year cohort among lung transplant recipients, indicating high-risk settings but not general population distribution.

Transmission is presumed to occur via inhalation of aerosolized bacteria from environmental sources such as contaminated water or soil; no direct person-to-person transmission has been documented in the source material. The absence of explicit transmission routes in the snippets precludes specification of exposure timing, dose-response, or vehicle types. No data on airborne vs. droplet vs. fomite transmission are available from the provided content.

Immunocompromised individuals, especially those with advanced HIV/AIDS, are identified as high-risk for severe disease. Lung transplant recipients are explicitly noted in the referenced cohort study as a vulnerable group. No other specific risk categories (e.g., elderly, chronic lung disease, occupational exposure) are supported by the source snippets. The absence of additional demographic or comorbidity data means that risk stratification beyond these two groups cannot be inferred.

Preventive strategies are not detailed in the source material. Given the environmental nature of NTM, control measures would logically involve minimizing exposure to contaminated water or aerosols, particularly in high-risk groups such as immunocompromised individuals. No specific interventions, hygiene recommendations, or engineering controls are described in the available snippets. No vaccine or prophylactic agent is mentioned.

In surveillance contexts, NTM infection should be interpreted as a marker of underlying immunosuppression or environmental exposure rather than a primary infectious threat. Due to lack of standardized coding and limited reporting infrastructure, case detection may be underrepresented. Surveillance efforts should prioritize identification of cases in high-risk cohorts (e.g., post-transplant, HIV-positive patients) and differentiate NTM from TB using molecular or culture-based diagnostics. Source-backed detail on case definition, reporting thresholds, or temporal trends is not available.

1. 1 Wikidata. Non-tuberculous mycobacterial infection among lung transplant recipients: a 15-year cohort study.
2. 2 Wikipedia. Mycobacterium avium-intracellulare infection.

ICD-10

ICD-11

Total cases

4

Peak month

2000-08

Coverage

1 reporting countries · 2000-01-01 → 2026-05-01