Newer antistaphylococcal agents

John S Bradley1

  • 1Division of Infectious Diseases, Children's Hospital San Diego, San Diego, California 92123, USA. jbradley@chsd.org

Abstract

Insights

Antibiotic resistance in staphylococci is rising, impacting pediatric treatments. Assessing local resistance patterns is crucial for effective empiric and definitive antibiotic therapy decisions in children.

Area of Science:

  • Pediatric Infectious Diseases
  • Antimicrobial Resistance
  • Staphylococcal Infections

Background:

  • Increasing antibiotic resistance in staphylococci, including methicillin-resistant Staphylococcus aureus (MRSA), challenges traditional pediatric treatments with first-generation cephalosporins, penicillins, and macrolides.
  • Local resistance trends are critical for guiding empiric antibiotic therapy decisions in pediatric staphylococcal infections.
  • Assessing pathogen-specific resistance patterns allows for informed selection of alternative antibiotic agents for definitive therapy.

Purpose of the Study:

  • To review the evolving landscape of antibiotic resistance in staphylococci affecting children.
  • To highlight the importance of understanding local resistance patterns for effective treatment strategies.
  • To discuss current and emerging therapeutic options for staphylococcal infections in pediatric populations.

Main Methods:

  • Review of current literature on antibiotic resistance trends in staphylococci.
  • Analysis of therapeutic options for community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) in children.
  • Evaluation of newly approved and investigational agents for staphylococcal infections.

Main Results:

  • Treatment of MRSA and macrolide-resistant Staphylococcus aureus in children may involve vancomycin, linezolid, or clindamycin (if susceptible).
  • Daptomycin is approved for adults, with second-generation glycopeptides (dalbavancin, oritavancin) in adult clinical trials.
  • New cephalosporins active against MRSA are in preclinical development.

Conclusions:

  • The rise of CA-MRSA necessitates a revised approach to treating staphylococcal infections in pediatric care.
  • Newer agents like linezolid are approved for children, while adult-approved medications are under investigation for pediatric use.
  • Older, less costly antibiotic agents may still offer effective treatment options for staphylococcal infections, though data from prospective studies are limited.

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...
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...
Hand hygiene01:23

Hand hygiene

Asepsis is the practice of preventing or breaking the chain of infection. The nurse employs aseptic techniques to prevent the spread of microorganisms and reduce the risk of diseases. Hand hygiene is the cornerstone of aseptic techniques and is classified into medical and surgical asepsis. Medical asepsis includes hand hygiene and the use of gloves. Surgical asepsis, or the sterile technique, refers to practices that render and keep objects and areas free of microorganisms.
Hand washing...
Inhibitors of Gram-positive Cell Wall Synthesis01:23

Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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...
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...