Objective: The purpose of this study was to evaluate the effect of a modeled microgravity environment on the antimicrobial resistance of Acinetobacter baumannii.
Design: Clinical isolates of A. baumannii (n=10) in Mueller Hinton broth were grown in high aspect ratio vessels using a rotary cell culture system oriented to achieve either normal earth gravity (1 x G) or low sheer modeled microgravity (LSMMG) conditions. After culture MICs were determined by Etest. Antimicrobials included in the study were amikacin, ampicillin/sulbactam, azithromycin, ceftazidime, gatifloxacin, gentamicin, imipenem, meropenem, minocycline, ticarcillin/clavulanic acid, tigecycline, and trimethoprim/sulfamethoxazole. Results were compared for MIC value and category interpretation (S, I, R).
Results: Overall category agreement was 100% (360/360). 100% of MIC values compared were within one twofold dilution of each other.
Conclusion: Under these test conditions LSMMG had no apparent effect on the resistance pattern of A. baumannii.
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