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Comparison of Methods for Determining the Antibiotic Susceptibility of Aerococcus Species in a Clinical Setting
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Comparison of Methods for Determining the Antibiotic Susceptibility of Aerococcus Species in a Clinical Setting
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Comparison of Methods for Determining the Antibiotic Susceptibility of Aerococcus Species in a Clinical Setting
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Journal Article
Comparison of Methods for Determining the Antibiotic Susceptibility of Aerococcus Species in a Clinical Setting
2022
Overview
Abstract
Objectives
Aerococcus spp are Gram-positive cocci increasingly recognized as uropathogens. The Clinical and Laboratory Standards Institute recently published specific breakpoints for Aerococcus spp (M45, third edition); however, the standardized method used for antimicrobial susceptibility testing (AST) requires media not often maintained in clinical laboratories. The purpose of this study was to evaluate and compare alternative methods of AST for Aerococcus isolates.
Methods
AST was performed on 134 clinical isolates using the Etest on three different types of agar, Vitek 2, and BD Phoenix. These results were compared with broth microdilution using the Sensititre STP6F.
Results
Aerococcus exhibited low minimum inhibitory concentrations to benzylpenicillin, meropenem, linezolid, and vancomycin. Variable resistance was seen to levofloxacin, ceftriaxone, and tetracycline. Meropenem and vancomycin met all acceptance criteria with every alternative method tested. Benzylpenicillin and linezolid did not meet essential agreement on any AST method. Tetracycline met the majority of acceptance criteria with the exception of more than 3% very major error when using the Etest on chocolate agar, the Vitek 2, and BD Phoenix.
Conclusions
Overall, the alternate AST method with the highest agreement with broth microdilution was the Etest on Mueller-Hinton agar with 5% sheep blood and may be an optimal alternative to broth microdilution.
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