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Related Experiment Videos

NIH test, a problematic method for testing potency of inactivated rabies vaccine.

R Barth1, G Diderrich, E Weinmann

  • 1Behring Institute, Marburg, Federal Republic of Germany.

Vaccine
|August 1, 1988
PubMed
Summary

The NIH rabies vaccine test shows significant differences when using different challenge strains, impacting vaccine efficacy results. Alternative testing methods are recommended for more reliable rabies vaccine evaluation.

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Area of Science:

  • Veterinary Virology
  • Immunology
  • Vaccine Development

Background:

  • The National Institutes of Health (NIH) test is a standard method for evaluating rabies vaccine potency.
  • Purified chick embryo cell (PCEC) inactivated rabies vaccine is widely used in animal rabies prevention.
  • Assessing vaccine efficacy requires reliable and reproducible challenge models.

Purpose of the Study:

  • To critically review the NIH test for rabies vaccine potency.
  • To investigate the impact of different challenge strains on vaccine efficacy assessment.
  • To compare in vitro methods with in vivo challenge results.

Main Methods:

  • Four studies involving purified chick embryo cell inactivated rabies vaccine were analyzed.
  • Intracerebral challenge with homologous (LEP-C 26) and heterologous (CVS) rabies virus strains were performed.

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  • In vitro potency was assessed using single radial immunodiffusion and modified antibody binding tests.

    • Main Results:

    • A profound difference in vaccine efficacy was observed between homologous and heterologous intracerebral challenge.
    • CVS strains from different laboratories yielded uniform results when administered intracerebrally.
    • In vitro tests showed variability and did not fully correlate with in vivo challenge outcomes.

    Conclusions:

    • The choice of challenge strain significantly influences the outcome of rabies vaccine potency testing using the NIH test.
    • Standardization of challenge strains and methods is crucial for reliable vaccine evaluation.
    • Alternative in vitro or modified in vivo methods may offer more consistent and informative assessments of rabies vaccine efficacy.