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Synergistic Effect of Cefazolin Plus Fosfomycin Against and in an Experimental Model. | LitMetric

This study investigated the synergistic and activity of cefazolin plus fosfomycin against methicillin-susceptible and methicillin-resistant (MSSA and MRSA) to provide the basis for a potential treatment alternative. Antimicrobial susceptibility and synergy tests were performed with five MSSA and five MRSA isolates using the broth microdilution and chequerboard assays, respectively. The efficacy of cefazolin plus fosfomycin for the treatment of MRSA infections was assessed using the survival assay. Using fractional inhibitory concentration index (FICI), the evaluated combination of cefazolin plus fosfomycin showed synergistic activity against all MSSA and MRSA isolates tested. In addition, cefazolin susceptibility was recovered in all MRSA isolates except one fosfomycin-resistant strain when combined with fosfomycin at readily achievable concentrations. The survival assay demonstrated highly synergistic activity of cefazolin plus fosfomycin, resulting in a 44-52% reduction in mortality when compared to cefazolin-alone and fosfomycin-alone, respectively. If susceptibility to fosfomycin is either confirmed or can be assumed based on local resistance patterns, combination therapy with cefazolin plus fosfomycin could be a valuable treatment option for empirical as well as targeted therapy of and MRSA infections. Future studies proving the clinical significance of this combination therapy are therefore warranted.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8144499PMC
http://dx.doi.org/10.3389/fphar.2021.685807DOI Listing

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