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Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
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Antimicrobial resistance in Rhodococcus equi.

Agata A Cisek1, Magdalena Rzewuska1, Lucjan Witkowski2

  • 1Departament of Preclinical Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Warsaw, Poland.

Acta Biochimica Polonica
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Summary

Rhodococcus equi causes infections in animals and humans, with resistance to common antibiotics like macrolides and rifampicin posing treatment challenges. Understanding the molecular mechanisms of this antimicrobial resistance is crucial for developing effective therapies.

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Area of Science:

  • Veterinary Microbiology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Rhodococcus equi is a significant pathogen causing respiratory and non-respiratory infections in both animals and humans.
  • Current therapeutic strategies often face challenges due to the common acquirement of antimicrobial resistance.
  • A lack of established treatment protocols exists for R. equi infections resistant to macrolides and rifampicin.

Purpose of the Study:

  • To provide an overview of the antimicrobial susceptibility patterns of Rhodococcus equi.
  • To elucidate the molecular mechanisms underlying antimicrobial resistance in R. equi.
  • To inform the development of effective treatment strategies for R. equi infections.

Main Methods:

  • Review of existing literature on Rhodococcus equi antimicrobial susceptibility.
  • Analysis of molecular mechanisms contributing to antibiotic resistance.
  • Synthesis of information on cell envelope alterations, efflux pumps, enzymatic inactivation, and target site modifications.

Main Results:

  • Rhodococcus equi exhibits resistance to various chemotherapeutic agents, particularly macrolides and rifampicin.
  • Multiple molecular mechanisms contribute to antimicrobial resistance, including changes in cell envelope, efflux pump activity, antibiotic inactivation, and target site alterations.
  • The study highlights the complexity of resistance development in R. equi.

Conclusions:

  • Antimicrobial resistance in Rhodococcus equi is a complex issue driven by diverse molecular mechanisms.
  • Further research into these mechanisms is essential for guiding the selection of appropriate antimicrobial agents.
  • Developing effective treatment protocols for resistant R. equi strains remains a critical clinical challenge.