Mycobacterial diseases other than tuberculosis

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Public Health

Background:

• Tuberculosis (TB) incidence in the US has steadily declined.
• Concurrently, non-tuberculous mycobacterial (NTM) infections have risen in frequency and proportion.
• NTM infections present diverse clinical manifestations, including chronic pulmonary disease, lymphadenitis, and skeletal infections.

Purpose of the Study:

• To analyze the changing landscape of mycobacterial infections in the United States.
• To identify the primary etiologic agents of non-tuberculous mycobacterioses.
• To examine the factors contributing to the increase in disseminated NTM disease, particularly in immunocompromised populations.

Main Methods:

• Retrospective analysis of mycobacterial infection trends.
• Identification of predominant NTM species causing disease.
• Assessment of patient populations affected by disseminated NTM infections.

Main Results:

• Mycobacterium avium/Mycobacterium intracellulare complex, Mycobacterium kansasii, Mycobacterium marinum, Mycobacterium fortuitum/Mycobacterium chelonae complex, and Mycobacterium scrofulaceum are key NTM pathogens.
• Disseminated NTM disease has increased since 1986.
• Immunocompromised individuals, including those with AIDS, malignancy, organ transplants, and steroid use, are increasingly affected.

Conclusions:

• Non-tuberculous mycobacterial infections represent a growing public health concern.
• The rise in NTM infections is linked to an increasing population of immunocompromised patients.
• Treatment of NTM infections is challenging due to underlying conditions and inherent drug resistance.