Calcium sulphate mixed with antibiotics does not decrease efficacy against <i>Cutibacterium acnes</i> (formerly <i>Propionibacterium acnes</i>), <i>in vitro</i> study.

Couture, Anne; Lavergne, Valéry; Sandman, Emilie; Leduc, Jean-Michel; Benoit, Benoit; Leduc, Stéphane; Rouleau, Dominique M · J Orthop · 2020

basic_science · Level V

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Abstract

This study explored the <i>in vitro</i> efficacy of antibiotics mixed with calcium sulfate (ACS) against <i>Cutibacterium acnes (C. acnes).</i> <i>C. acnes</i> isolates from orthopaedic infection sites were tested for antimicrobial susceptibility with ACS. Minimal inhibitory concentrations (MIC) were determined with a gradient diffusion method (Etest® strips). When tested with Etest®, all 22 isolates were susceptible to penicillin, ceftriaxone, vancomycin, and two were resistant to clindamycin (MICs of 4 and 8 mg/L). Penicillin and rifampin had the largest inhibition zone diameters. Antibiotics retained activity against <i>C. acnes</i> when mixed with calcium sulfate.