Thymine-requiring bacteria associated with co-trimoxazole therapy

Area of Science:

• Microbiology
• Clinical Medicine
• Pharmacology

Background:

• Thymine-requiring (thy-) bacterial mutants have been isolated from patients with specific infections.
• These isolations occurred after prolonged co-trimoxazole treatment.

Purpose of the Study:

• To investigate the development of thy- mutants in patients undergoing co-trimoxazole therapy.
• To understand the clinical implications and identify factors contributing to mutant emergence.

Main Methods:

• Isolation and identification of thy- mutants from patient samples (urine, sputum).
• Utilized diagnostic sensitivity test agar (deficient in thymine) for mutant identification.
• Assessed the role of wild-type bacteria and patient urine in supporting mutant growth in vitro.

Main Results:

• Thy- mutants were isolated from 8 patients with renal calculi and 1 with chronic chest infection.
• Persistent pyuria and purulent sputum were noted in affected patients.
• Wild-type bacteria and urine compounds supported in vitro growth of thy- mutants, suggesting nutrient availability.

Conclusions:

• Co-trimoxazole therapy can lead to the development of thy- mutants, particularly in renal calculi.
• Early detection and change of antimicrobial therapy are recommended upon identification of mutant infections.