Introduction
Staphylococcus warneri (S. warneri ) is a type of
coagulase-negative staphylococci (CoNS) and is part of the normal flora
of the skin, especially the nares, head, legs, and
arms1. S. warneri is present in about 50% of
healthy adults and represents approximately 4.0% to 7.8% of all skin
staphylococci in healthy adults2–9. S. warneriis not frequently recognized as a significant human pathogen but is
occasionally isolated from immunocompromised patients or patients with
medical devices, such as prosthetic heart valves, central venous
catheter, and disk prosthesis1. S. warneri is
rarely reported as a causative agent of infective endocarditis
(IE)1. Here, we reported a rare case of native mitral
valve IE caused by S. warneri in a 72-year-old Asian woman who
had mitral valve regurgitation without valvular heart prosthesis. To
analyze the demographic characteristics, predisposing factors,
comorbidities, and outcomes of such cases, we reviewed previously
reported cases of IE caused by S. warneri.