"Multidrug-resistant tuberculosis" may be nontuberculous mycobacteria.

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Public Health

Background:

• Multidrug-resistant tuberculosis (MDR-TB) poses a significant global health challenge, particularly in developing nations.
• Nontuberculous mycobacteria (NTM) share clinical and radiological similarities with tuberculosis, complicating diagnosis.
• This study investigated the prevalence of NTM infections in individuals suspected of MDR-TB.

Purpose of the Study:

• To determine the frequency of NTM infections among patients with suspected MDR-TB.
• To evaluate the clinical outcomes and risk factors for poor prognosis in patients with NTM disease.

Main Methods:

• Retrospective analysis of patients with suspected MDR-TB from 2009-2014.
• Mycobacterial cultures performed, with species identification using phenotypic and molecular methods.
• Evaluation of patient outcomes and risk factors for NTM disease.

Main Results:

• 30% (35/117) of isolates from suspected MDR-TB patients were identified as NTM.
• 27% (32/117) of patients met diagnostic criteria for NTM disease.
• Among confirmed NTM cases, 90% had underlying conditions (e.g., malignancy, organ transplant, HIV).
• Treatment outcomes showed 63% cure rate, but 37% experienced poor outcomes (treatment failure or death).

Conclusions:

• NTM infections are a significant consideration in patients with suspected MDR-TB.
• The high burden of NTM disease necessitates its inclusion in the differential diagnosis for TB-like presentations.
• Prompt identification and appropriate management of NTM are crucial to improve patient outcomes and reduce healthcare costs.