Inducible clindamycin resistance among methicillin-sensitive Staphylococcus aureus infections in pediatric patients

Dror S Shouval1, Zmira Samra, Itamar Shalit

  • 1Department of Pediatrics C, Schneider Children's Medical Center of Israel, Petah Tikva, Israel.

Abstract

Insights

Inducible clindamycin resistance is common in pediatric Staphylococcus aureus infections in Israel. Routine D-tests are recommended for methicillin-sensitive Staphylococcus aureus (MSSA) to detect this resistance.

Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Clinical Pediatrics

Background:

  • Staphylococcus aureus infections pose a significant global health burden.
  • Clindamycin is a common antibiotic for staphylococcal infections.
  • Increasing prevalence of inducible clindamycin resistance (ICR) is observed.

Purpose of the Study:

  • To determine the prevalence of ICR in pediatric methicillin-sensitive Staphylococcus aureus (MSSA) infections in Israel.
  • To evaluate the significance of ICR in clinical settings.

Main Methods:

  • Retrospective review of pediatric MSSA infection cases from January 2006 to June 2007.
  • Antibiogram testing, including the D-test for ICR.
  • Phage typing and randomly amplified polymorphic DNA analysis.

Main Results:

  • 240 MSSA isolates were analyzed, primarily from wounds and abscesses.
  • ICR was found in 26% of all MSSA isolates (62/240).
  • A specific clone of phage type 2 was associated with ICR.

Conclusions:

  • Inducible clindamycin resistance is prevalent in pediatric MSSA in Israel.
  • Routine D-testing for ICR in MSSA is recommended for appropriate treatment.
  • Understanding ICR prevalence is crucial for antibiotic stewardship.

Related Concept Videos

Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

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 the One...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...