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Related Experiment Videos

Development of an antimicrobial susceptibility testing method suitable for performance during space flight

J H Jorgensen1, J A Skweres, S K Mishra

  • 1Department of Pathology, University of Texas Health Science Center, San Antonio 78284-7750, USA.

Journal of Clinical Microbiology
|August 1, 1997
PubMed
Summary

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This study developed a simple method for testing antibiotic effectiveness against bacteria in microgravity. Reproducible results were achieved, offering insights into how space flight affects antimicrobial activity.

Area of Science:

  • Microbiology
  • Space Medicine
  • Pharmacology

Background:

  • The impact of microgravity on antimicrobial efficacy against bacterial pathogens is largely unknown.
  • Understanding these effects is crucial for astronaut health during long-duration space missions.

Purpose of the Study:

  • To develop and validate a method for performing antibacterial susceptibility testing in the microgravity environment of space flight.
  • To assess the reproducibility of antimicrobial activity testing using specialized cards during simulated space conditions.

Main Methods:

  • Utilized specially prepared Vitek research cards containing serial dilutions of 14 antimicrobial agents.
  • Incorporated a colorimetric growth indicator (alamarBlue) for visual determination of Minimum Inhibitory Concentrations (MICs).
Keywords:
NASA Center JSCNASA Discipline Environmental Health

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  • Tested against common bacterial pathogens including Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa.

    • Main Results:

    • Demonstrated reproducible susceptibility testing results for multiple bacterial species in microgravity conditions.
    • MIC values were comparable to standard broth microdilution methods, with some variations attributed to the unique test format.
    • Ground-based studies confirmed reproducibility after 7-day refrigerated storage, supporting in-flight feasibility.

    Conclusions:

    • The developed method provides a safe, compact, and reproducible approach for in-flight antibacterial susceptibility testing.
    • This research will yield novel data on the effects of microgravity on the biological activity of antibiotics.
    • Findings are vital for developing effective countermeasures against bacterial infections in space.