Microbiology of cutaneous tuberculosis

Area of Science:

• Microbiology
• Dermatology
• Infectious Diseases

Background:

• Cutaneous tuberculosis presents diverse clinical forms.
• Bacteriological characterization is essential for understanding disease pathogenesis and guiding treatment.
• Drug resistance in mycobacteria complicates treatment outcomes.

Purpose of the Study:

• To detail the bacteriological characteristics of mycobacteria isolated from cutaneous tuberculosis cases.
• To assess the drug sensitivity patterns of these isolated mycobacteria.
• To identify potential resistance mechanisms in Mycobacterium tuberculosis and anonymous mycobacteria.

Main Methods:

• Isolation and identification of mycobacteria from clinical samples of cutaneous tuberculosis patients.
• Drug sensitivity testing using standard antimicrobial agents (streptomycin, isoniazid, PAS, thiacetazone, ethionamide, ethambutol).
• Analysis of resistance patterns in both Mycobacterium tuberculosis and anonymous mycobacterial strains.

Main Results:

• Mycobacteria were isolated from 12 out of 51 cutaneous tuberculosis cases.
• Nine isolates were identified as Mycobacterium tuberculosis, and three were classified as anonymous mycobacteria.
• Three Mycobacterium tuberculosis strains exhibited acquired resistance to one or more drugs; all anonymous strains showed resistance to most tested drugs except ethionamide and ethambutol.

Conclusions:

• Drug resistance is a significant concern in cutaneous tuberculosis, affecting both Mycobacterium tuberculosis and anonymous mycobacteria.
• Anonymous mycobacteria demonstrate a concerningly high level of resistance to common anti-tuberculosis drugs.
• These findings highlight the need for tailored therapeutic approaches and continuous monitoring of drug resistance patterns in cutaneous tuberculosis.