Mixed infections in tuberculosis: The missing part in a puzzle

Area of Science:

• Microbiology
• Infectious Diseases
• Genetics

Background:

• Mixed strains infection, involving multiple Mycobacterium tuberculosis strains, presents significant challenges in tuberculosis (TB) control.
• Simultaneous isolation of different TB strains in patients complicates diagnosis and treatment strategies.

Purpose of the Study:

• To review current understanding of mixed strains infection in TB.
• To evaluate the importance of identifying mixed infections, including those with varying drug susceptibility patterns, for diagnosis and treatment.
• To highlight the accuracy and clinical utility of direct genotyping methods for clinical specimens.

Main Methods:

• Review of current literature on mixed strains TB infection.
• Comparison of genotyping techniques such as MIRU-VNTR and whole genome sequencing (WGS) for mixed infection detection.
• Evaluation of diagnostic and treatment implications of mixed TB infections.

Main Results:

• MIRU-VNTR offers higher sensitivity and discriminative power compared to many other genotyping techniques for mixed infection detection.
• Whole genome sequencing (WGS) provides high-resolution insights into mixed infections but is currently limited to developed countries.
• Mixed infections can involve strains with differing susceptibility patterns, potentially altering treatment outcomes.

Conclusions:

• Accurate identification of mixed strains infection is vital for effective TB diagnosis and treatment.
• Direct genotyping of clinical specimens, utilizing advanced techniques, is essential for managing complex TB cases.
• Further research and accessibility of advanced technologies like WGS are needed globally for improved TB control.