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Non-tuberculous Mycobacteria — SCE Infectious Diseases MCQ

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HardTuberculosisNon-tuberculous MycobacteriaSCE Infectious Diseases

A 48-year-old man presents with chronic productive cough, recurrent sinusitis, and bronchiectasis. Sputum culture repeatedly grows Pseudomonas aeruginosa. He is also found to have elevated sweat chloride at 65 mmol/L. Sputum now grows an acid-fast organism identified as Mycobacterium abscessus. What treatment principle applies to M. abscessus pulmonary disease?

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Correct answer: AMulti-drug regimen including IV Amikacin, IV Tigecycline or Imipenem, and oral macrolide

M. abscessus is one of the most treatment-resistant NTM species. The treatment regimen is complex and prolonged: an induction phase typically includes IV Amikacin, IV Tigecycline (or Imipenem/Cefoxitin), and an oral macrolide (Azithromycin or Clarithromycin), with transition to oral agents for a continuation phase. Macrolide susceptibility (erm gene status) must be checked as inducible macrolide resistance is common in M. abscessus subsp. abscessus. Total treatment duration is typically 12+ months of culture-negative sputum. Standard TB drugs are ineffective.

Reference: https://www.nice.org.uk/guidance/conditions-and-diseases/infections