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Updated: Aug 26, 2026

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat
Published on: June 4, 2012
Polyclonal staphylococcus endocarditis
E Van Wijngaerden1, W E Peetermans, S Van Lierde
1Rega Institute, Catholic University of Leuven, Belgium.
Insights
Coagulase-negative staphylococcus (CNS) endocarditis can involve multiple distinct bacterial genotypes. This polyclonality, shown in a case of aortic homograft endocarditis, may impact treatment strategies and antibiotic susceptibility testing for prosthetic device infections.
Area of Science:
- Infectious Diseases
- Microbiology
- Genomics
Background:
- Coagulase-negative staphylococcus (CNS) is a leading cause of hospital-acquired infections, including bacteremia and prosthetic valve endocarditis.
- While CNS bacteremia can be polyclonal, the clonality of CNS in endocarditis remains largely uncharacterized.
- Prosthetic device infections caused by CNS share pathogenic similarities across various devices.
Abstract:
Coagulase-negative staphylococcus (CNS) is the most frequent cause of nosocomial bacteremia and prosthetic valve endocarditis. CNS bacteremia can be polyclonal. No data exist on the clonality of CNS causing endocarditis. We present a case of CNS aortic homograft endocarditis in which at least five different genotypes of CNS were identified in initial blood-culture isolates by genomic macrorestriction enzyme analysis and pulsed field gel electrophoresis. Since the polyclonality was accompanied by differences in antibiotic susceptibility, this observation may have important consequences for the treatment of CNS endocarditis. Because of the parallels in the pathogenesis of CNS prosthetic valve endocarditis and CNS infections of a variety of other prosthetic devices, it might also have consequences for CNS prosthetic device infections in general. We suggest that antibiotic susceptibility testing of just one blood-culture isolate may be insufficient.
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