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ASSESSMENT OF THE POTENCY OF TUBERCULIN IN HUMANS AND GUINEA-PIGS
Bulletin of the World Health Organization
|January 1, 1964
Summary
Tuberculin test results vary based on the preparation and testing method. Potency estimates for tuberculin products depend heavily on how they are assessed, highlighting the need for context-specific evaluation.
Area of Science:
- Immunology
- Microbiology
- Pharmacology
Background:
- Tuberculin preparations contain various substances affecting biological responses.
- The concentration of active substances varies across different tuberculin products.
- Assessing tuberculin potency is complex due to these variations.
Purpose of the Study:
- To demonstrate the dependence of tuberculin potency estimates on assessment methods.
- To compare the potency ratio of two purified protein derivative (PPD) tuberculin preparations.
Main Methods:
- An experiment was conducted using two PPD tuberculin preparations (RT 23 and PPD-Weybridge).
- Potency was assessed in humans using the Pirquet test.
- Potency was assessed in guinea-pigs using the Mantoux test.
Main Results:
- The potency ratio between RT 23 and PPD-Weybridge varied significantly between human and guinea-pig tests.
- Human Pirquet tests yielded different potency ratios compared to guinea-pig Mantoux tests.
- This demonstrates the variability in potency estimation based on the biological material and test technique.
Conclusions:
- Tuberculin product potency is highly dependent on the assessment methodology.
- Assessment conditions must align with the intended use conditions for tuberculin products.
- Standardized evaluation under relevant conditions is crucial for accurate tuberculin potency determination.