Arias Lab

Methodist Hospital Research Institute

Houston · United States

NIH-funded
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NIH R01 · 2025

Clinical Impact of the Cefazolin Inoculum Effect

ABSTRACT Staphylococcus aureus is a major human pathogen responsible for a wide range of life-threatening infections. Many of these infections are caused by methicillin-susceptible S. aureus (MSSA). MSSA represent a major burden among S. aureus infections and are important contributors to mortality. For decades, the first line of therapy for severe MSSA infections have been the isoxazolyl-penicillins (ISP, e.g., nafcillin). However, recent data suggest that clinical outcomes in MSSA bacteremia are similar in patients treated with cefazolin (vs nafcillin), a cephalosporin with activity against MSSA that appears to be less toxic. Indeed, treatment with nafcillin seems to be associated with…

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