Effects of Refrigerating Preinoculated Vitek Cards on Microbial Physiology and Antibiotic Susceptibility

Paper #:
  • 921214

Published:
  • 1992-07-01
Citation:
Skweres, J., Bassinger, V., Mishra, a., and Pierson, D., "Effects of Refrigerating Preinoculated Vitek Cards on Microbial Physiology and Antibiotic Susceptibility," SAE Technical Paper 921214, 1992, https://doi.org/10.4271/921214.
Pages:
11
Abstract:
Reference cultures of 16 microorganisms obtained from the American Type Culture Collection and four clinical isolates were used in standardized solutions to inoculate 60 cards for each test strain. A set of three ID and three susceptibility cards was processed in the Vitek AutoMicrobic System (AMS) immediately after inoculation. The remaining cards were refrigerated at 4°C, and sets of six cards were removed and processed periodically for up to 17 days. The preinoculated AMS cards were evaluated for microorganism identification, percent probability of correct identification, length of time required for final result, individual substrate reactions, and antibiotic minimal inhibitory concentration (MIC) values. Results indicate that 11 of the 20 microbes tested withstood refrigerated storage up to 17 days without detectable changes in delineating characteristics. MIC results appear variable, but certain antibiotics proved to be more stable than others. The results of these exploratory studies will be used to plan a microgravity experiment designed to study the effect of microgravity on microbial physiology and antibiotic sensitivity.
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