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Updated: Sep 9, 2025
Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus MRSA in Rat
Published on: June 4, 2012
A systematic review and meta-analysis of the risk of mortality associated with methicillin-resistant Staphylococcus
Anastasia A Asantewaa1, Samuel N-A Yartey1, Eric S Donkor1
1Department of Medical Microbiology, University of Ghana Medical School, Korle Bu, Accra, Ghana.
Objectives:
This systematic review and meta-analysis aimed to quantify mortality associated with MRSA clones and evaluate the contribution of specific molecular features to outcome variation.
Methods:
Databases including PubMed, Scopus, Web of Science, and Google Scholar were searched for studies reporting mortality among patients with MRSA infection and associated molecular typing data, including clonal complex, sequence type and SCCmec type. Results were presented in thematic narratives, tables and figures. A random-effects meta-analysis was performed to estimate pooled mortality and prevalence proportions.
Results:
Twenty-seven included studies reported on MRSA isolates from 12 different countries. The overall pooled mortality was 22.47% (95% CI: 17.31-28.07), with the highest mortality observed in Europe. Among MRSA clonal complexes, the highest mortality was observed among CC5 (50.75%), followed by CC8 (37.56%). Although ST72 (66.16%) was the most prevalent sequence type, the highest mortality rates were observed in ST764 (38.74%) and ST1 (38.72%). SCCmec type IV (36.95%) was dominant but had a lower mortality rate (18.71%) compared to types II (39.09%) and III (27.52%).
Conclusions:
The clear dominance and lethality of specific lineages affirm the clinical utility of molecular diagnostics in guiding treatment and predicting outcomes. These insights call for an expansion of MRSA typing programs in hospital laboratories and national surveillance systems.
Insights
Methicillin-resistant Staphylococcus aureus (MRSA) clones significantly impact patient mortality. Specific MRSA lineages, like CC5 and ST764, show higher lethality, underscoring the need for molecular diagnostics in healthcare.
Area of Science:
- Infectious Diseases
- Molecular Epidemiology
- Public Health
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) is a major global pathogen with increasing antimicrobial resistance.
- MRSA's evolving clonal structure contributes to its clinical significance and disease burden.
- Understanding MRSA clone-specific mortality is crucial for effective clinical management.
Purpose of the Study:
- To systematically review and meta-analyze mortality rates associated with different MRSA clones.
- To evaluate the impact of specific molecular features (clonal complex, sequence type, SCCmec type) on MRSA infection outcomes.
- To identify high-risk MRSA lineages and inform public health surveillance strategies.
Main Methods:
- Systematic literature search across major scientific databases (PubMed, Scopus, Web of Science, Google Scholar).
- Inclusion of studies reporting MRSA infection mortality and molecular typing data.
- Random-effects meta-analysis to pool mortality proportions and assess prevalence.
Main Results:
- Twenty-seven studies from 12 countries were included, with an overall pooled MRSA mortality of 22.47%.
- Clonal Complex 5 (CC5) exhibited the highest mortality (50.75%), followed by CC8 (37.56%).
- Sequence Type 764 (ST764) and ST1 showed the highest mortality rates (38.74% and 38.72%, respectively), despite ST72 being most prevalent.
- SCCmec type II and III were associated with higher mortality than the dominant SCCmec type IV.
Conclusions:
- Specific MRSA lineages, identified through molecular typing, are clearly associated with increased lethality.
- Molecular diagnostics are clinically valuable for predicting MRSA patient outcomes and guiding treatment decisions.
- Expansion of MRSA typing programs in laboratories and surveillance systems is recommended to enhance public health responses.
