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Activity of Tedizolid in Methicillin-Resistant Staphylococcus epidermidis Experimental Foreign Body-Associated Osteomyelitis.
Antimicrobial Agents and Chemotherapy 2017 Februrary
We developed a rat model of methicillin-resistant Staphylococcus epidermidis (MRSE) foreign body-associated osteomyelitis and used it to compare tedizolid alone and in combination with rifampin against rifampin alone, vancomycin plus rifampin, and vancomycin alone. A clinical strain of MRSE was inoculated into the proximal tibia, and a stainless steel wire with a precolonized MRSE biofilm was implanted. Following a 1-week infection period, 92 rats received either no treatment (n = 17) or 14 days of intraperitoneal tedizolid (n = 15), tedizolid plus rifampin (n = 15), rifampin (n = 15), vancomycin plus rifampin (n = 15), or vancomycin (n = 15). Quantitative bone and wire cultures were performed after treatment completion and also 1 week after infection in a separate group of five rats. The median quantity of staphylococci in bone after the 1-week infection period was 4.89 log10 CFU/g bone (interquartile range, 3.83 to 5.33 log10 CFU/g bone); staphylococci were recovered from all associated wires. A median quantity of staphylococci of 3.70 log10 CFU/g bone was detected in bones of untreated control rats after 3 weeks. Quantities of staphylococci in bones of all treatment groups except the group receiving vancomycin alone (2.78 log10 CFU/g) were significantly lower than those for untreated controls, with no staphylococci being detected in the groups receiving rifampin monotherapy, tedizolid-plus-rifampin combination therapy, and vancomycin-plus-rifampin combination therapy. Quantities of staphylococci on wires from all treatment groups that included rifampin were significantly lower than those for untreated controls. No resistance to rifampin, tedizolid, or vancomycin was detected. Tedizolid combined with rifampin was active in a rat model of MRSE foreign body-associated osteomyelitis.
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