Infectious Disease · General Practice · 1 h ago
Doxycycline pretreatment did not significantly improve cure with minocycline–metronidazole
In a cohort of 262 people with macrolide-resistant Mycoplasma genitalium, overall microbial cure after 14 days of minocycline plus metronidazole was 80.9%. Cure rates were not significantly higher with preceding doxycycline, although pretreatment may have been beneficial among patients who had failed earlier regimens.
- Overall cure was 80.9% in 262 patients.
- Doxycycline pretreatment did not significantly improve overall cure.
- Cervicovaginal infections had higher cure than urethral infections.
- Adverse effects were not significantly increased with pretreatment.
Antimicrobial options for macrolide-resistant Mycoplasma genitalium are limited. This study evaluated microbial cure and tolerability with 14 days of minocycline plus metronidazole, with or without seven days of doxycycline beforehand. Cure was defined as a negative transcription-mediated amplification test 14–90 days after treatment. The cohort included 262 patients; treatment was not described as randomized in the available abstract.
Overall, 212 of 262 patients (80.9%; 95% CI, 75.6%–85.5%) were cured. Among those who received doxycycline pretreatment, 149 of 181 (82.3%) were cured, compared with 63 of 81 (77.8%) without pretreatment (P=0.387). Patients with prior treatment failures were more likely to be cured with pretreatment. Cure was higher for cervicovaginal than urethral infections. Gastrointestinal and central nervous system adverse effects were not significantly increased with doxycycline.
The findings do not show a significant overall benefit from adding doxycycline before the combination regimen. The authors report cure comparable to moxifloxacin in their setting, but the supplied abstract provides no direct comparative study details. The cohort findings do not establish comparative efficacy, and the possible benefit in previously treated patients requires cautious interpretation.
In practice
For patients with macrolide-resistant Mycoplasma genitalium, this cohort found microbial cure in about 81% after 14 days of minocycline plus metronidazole. Adding seven days of doxycycline beforehand was not associated with a statistically significant improvement in overall cure, although a subgroup with prior treatment failures appeared more likely to benefit. These data may inform consideration of treatment options, but the available abstract does not describe randomization or a direct comparative analysis with moxifloxacin; they do not establish that one regimen is superior or justify routine pretreatment.
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Antimicrobial Agents and Chemotherapy: Does pre-treatment with doxycycline improve the efficacy of combination minocycline and metronidazole for macrolide-resistant Mycoplasma genitalium infections? ↗This is an automated AI-condensed summary that has not yet been reviewed by an editor. Always consult the full item at the original source.