Strains of methicillin-resistant Staphylococcus aureus isolated in Australian hospitals from 1986 to 1990. Australian

A M Vickery1

  • 1Department of Microbiology, Royal Prince Alfred Hospital, Sydney, Australia.

Insights

Methicillin-resistant Staphylococcus aureus (MRSA) strains in Australia showed predominant types between 1986-1990. One strain, 83A/85/95 weak/88@87M, persisted throughout the study period.

Area of Science:

  • Microbiology
  • Epidemiology
  • Infectious Diseases

Background:

  • Staphylococcus aureus is a significant pathogen.
  • Methicillin-resistant Staphylococcus aureus (MRSA) poses a global health threat.
  • Understanding MRSA strain epidemiology is crucial for infection control.

Purpose of the Study:

  • To characterize the predominant phage types of MRSA in Australia.
  • To monitor MRSA strain prevalence over a five-year period (1986-1990).

Main Methods:

  • Phage typing of clinically significant MRSA isolates from Australian teaching hospitals.
  • Utilized the Basic International Set and an Australian experimental set of typing phages.
  • Analysis of isolates collected annually from 1986 to 1990.

Main Results:

  • One to two predominant MRSA strains were identified in each Australian state annually.
  • Over 86% of isolates belonged to strains detected at least five times within a survey year.
  • Phage types 83A/85/95/90/88@47T/90A/87M/13M and 85/90/88@47T/90A/87A were most prevalent, identified in four of five surveys.
  • MRSA phage type (83A/85/95) weak/88@87M demonstrated persistence throughout the study period.

Conclusions:

  • MRSA epidemiology in Australia during 1986-1990 was characterized by a few dominant strains.
  • Specific MRSA phage types showed significant prevalence and persistence.
  • Continued surveillance of MRSA strains is essential for effective public health strategies.

Related Concept Videos

Mismatch Repair01:36

Mismatch Repair

Overview
Antibiotic Selection00:57

Antibiotic Selection

Overview
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...
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...
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...
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...