Community-acquired methicillin-resistant Staphylococcus aureus: a cause of musculoskeletal sepsis in children

D P Gwynne-Jones1, N S Stott

  • 1Department of Paediatric Orthopaedic Surgery, Starship Children's Hospital, Auckland, New Zealand.

Insights

Methicillin-resistant Staphylococcus aureus (MRSA) caused 20% of pediatric musculoskeletal infections, including deep sepsis. Consider MRSA in severe staphylococcal infections unresponsive to antibiotics.

Area of Science:

  • Pediatric Orthopaedics
  • Infectious Diseases
  • Microbiology

Background:

  • Staphylococcus aureus is a common cause of pediatric musculoskeletal infections.
  • The prevalence of antibiotic resistance in S. aureus strains is a growing concern.

Observation:

  • A 20% incidence of methicillin resistance was observed in S. aureus isolates from pediatric musculoskeletal infections over a one-year period.
  • Most methicillin-resistant S. aureus (MRSA) infections were community-acquired and superficial, but four cases of deep sepsis occurred.

Findings:

  • Twenty-six out of 130 pediatric S. aureus musculoskeletal infections (20%) were caused by methicillin-resistant strains.
  • Deep musculoskeletal sepsis was identified in four patients with MRSA infections.

Implications:

  • In communities with high MRSA prevalence, methicillin resistance should be suspected in severe staphylococcal infections.
  • Treatment decisions for pediatric S. aureus musculoskeletal infections should consider local MRSA resistance patterns and clinical presentation.

Related Concept Videos

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...
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...
Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
Bacterial Meningitis01:24

Bacterial Meningitis

Bacterial meningitis is a severe infectious disease involving inflammation of the meninges, the protective membranes surrounding the brain and spinal cord. It occurs when pathogenic bacteria cross the blood–brain barrier and enter the cerebrospinal fluid. Common causative organisms include Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae type b, Listeria monocytogenes, and Escherichia coli K1. The exact route of entry varies by pathogen and host condition.Routes of Entry...
Rocky Mountain Spotted Fever01:26

Rocky Mountain Spotted Fever

Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.