Antimicrobial Resistance in Mycoplasma spp

Area of Science:

• Veterinary Microbiology
• Antimicrobial Resistance
• Molecular Biology

Background:

• Mycoplasmas exhibit intrinsic resistance to certain antibiotic classes, including cell wall inhibitors and sulfonamides.
• Macrolides and tetracyclines are primary treatments for animal mycoplasmal infections, but resistance is emerging.
• Standardizing susceptibility testing for mycoplasmas is challenging due to unique growth requirements and lack of quality control strains.

Purpose of the Study:

• To review current knowledge on antimicrobial resistance in key veterinary pathogenic Mycoplasma species.
• To identify prevalent resistance patterns and underlying genetic mechanisms.
• To highlight the need for harmonized susceptibility testing and breakpoint determination for Mycoplasma.

Main Methods:

• Review of existing literature on Mycoplasma antimicrobial susceptibility and resistance.
• Analysis of reported resistance frequencies in field isolates across different animal species and geographic regions.
• Identification of genetic mutations associated with resistance to various antibiotic classes.

Main Results:

• Significant resistance to macrolides and tetracyclines has been reported in field isolates of important veterinary Mycoplasma species (e.g., M. gallisepticum, M. bovis).
• Fluoroquinolones generally maintain good in vitro activity, and pleuromutilins show the most effectiveness.
• Common resistance mechanisms involve point mutations in target genes, including DNA gyrase, topoisomerase IV, and ribosomal RNA (rRNA) genes.

Conclusions:

• Antimicrobial resistance in veterinary Mycoplasma is a growing concern, necessitating careful drug selection.
• Standardized breakpoints and susceptibility testing methods are essential for reliable in vitro-in vivo correlation.
• Further research is needed to guide appropriate antimicrobial use and combat resistance in animal mycoplasmoses.