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Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA

Published on: February 9, 2011

Methicillin-resistant Staphylococcus aureus

Andie S Lee^1,2, Hermínia de Lencastre^3,4, Javier Garau⁵

¹Departments of Infectious Diseases and Microbiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia.

Nature Reviews. Disease Primers

|June 1, 2018

Abstract:

Since the 1960s, methicillin-resistant Staphylococcus aureus (MRSA) has emerged, disseminated globally and become a leading cause of bacterial infections in both health-care and community settings. However, there is marked geographical variation in MRSA burden owing to several factors, including differences in local infection control practices and pathogen-specific characteristics of the circulating clones. Different MRSA clones have resulted from the independent acquisition of staphylococcal cassette chromosome mec (SCCmec), which contains genes encoding proteins that render the bacterium resistant to most β-lactam antibiotics (such as methicillin), by several S. aureus clones. The success of MRSA is a consequence of the extensive arsenal of virulence factors produced by S. aureus combined with β-lactam resistance and, for most clones, resistance to other antibiotic classes. Clinical manifestations of MRSA range from asymptomatic colonization of the nasal mucosa to mild skin and soft tissue infections to fulminant invasive disease with high mortality. Although treatment options for MRSA are limited, several new antimicrobials are under development. An understanding of colonization dynamics, routes of transmission, risk factors for progression to infection and conditions that promote the emergence of resistance will enable optimization of strategies to effectively control MRSA. Vaccine candidates are also under development and could become an effective prevention measure.

Insights

Methicillin-resistant Staphylococcus aureus (MRSA) causes global infections, with varying prevalence due to diverse clones and resistance mechanisms. Understanding MRSA spread and resistance is key to developing new treatments and vaccines.

Area of Science:

Infectious Diseases
Microbiology
Antimicrobial Resistance

Background:

Methicillin-resistant Staphylococcus aureus (MRSA) has been a significant global pathogen since the 1960s.
MRSA infections occur in both healthcare and community settings, with notable geographical variations.
The emergence and spread of MRSA are driven by specific bacterial clones acquiring resistance genes, such as those on staphylococcal cassette chromosome mec (SCCmec).

Purpose of the Study:

To provide a comprehensive overview of the global burden and characteristics of MRSA.
To highlight the factors contributing to MRSA's success and clinical diversity.
To discuss current limitations in MRSA treatment and future therapeutic and preventive strategies.

Main Methods:

Review of epidemiological data on MRSA prevalence and geographical distribution.
Analysis of the genetic basis of MRSA resistance, including SCCmec elements.
Examination of MRSA virulence factors and clinical manifestations.
Assessment of current and emerging treatment and prevention strategies.

Main Results:

MRSA exhibits significant geographical variation in prevalence, influenced by infection control and circulating clones.
MRSA's success is attributed to a combination of virulence factors and resistance to multiple antibiotics, including beta-lactams.
Clinical presentations range from asymptomatic colonization to severe, life-threatening invasive infections.

Conclusions:

Effective control of MRSA requires a deeper understanding of its colonization, transmission, and resistance evolution.
Limited treatment options necessitate the development of novel antimicrobials and preventative measures, such as vaccines.

Read full analysis

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