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Related Experiment Videos

Viability of M. leprae while undergoing laboratory procedures

Sreevatsa1, K Katoch

  • 1Central JALMA Institute for Leprosy, Tajganj, Agra.

Indian Journal of Leprosy
|February 25, 1998
PubMed
Summary

Maintaining Mycobacterium leprae (M. leprae) viability is crucial for research. Optimal storage conditions and handling methods significantly impact M. leprae survival and infectivity in experimental settings.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Experimental Pathology

Background:

  • Mycobacterium leprae (M. leprae) is the causative agent of leprosy.
  • Accurate assessment of M. leprae viability and infectivity is essential for leprosy research.
  • Standardized experimental procedures are necessary to ensure reliable results.

Purpose of the Study:

  • To evaluate the impact of different storage conditions and experimental methodologies on M. leprae viability.
  • To determine the optimal conditions for maintaining M. leprae infectivity for research purposes.

Main Methods:

  • Mouse foot-pad experiments were conducted to assess M. leprae survival.
  • Viability was tested under various temperature conditions (37°C, 20-30°C, +4°C).
  • Effects of lyophilization, repeated temperature fluctuations, disinfectants, UV light, and centrifugation were examined.

Main Results:

  • M. leprae survived for 1 day at 37°C, 7 days at 20-30°C, and 90 days when lyophilized.
  • Refrigerated M. leprae showed reduced survival with repeated daily exposure to room temperature (5 days) compared to single exposure (14 days).
  • M. leprae lost infectivity within 30 minutes when exposed to disinfectants and UV light; high-speed centrifugation did not affect viability.

Conclusions:

  • Storage temperature and exposure to room temperature significantly influence M. leprae viability.
  • Lyophilization offers a long-term preservation method for M. leprae.
  • Disinfectants and UV light rapidly inactivate M. leprae, while centrifugation is a safe manipulation technique.

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