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The Value of Tuberculin Tests

Nature volume 130, pages 480481 (24 September 1932) | Download Citation



THE name ‘tuberculin’ has been applied to any extract, suspension, or other preparation of B. tuberculosis or of media on which it has grown. The Therapeutic Substances Regulations 1931 (Statutory Rules and Orders, No. 633) define the term in a more limited sense as preparations of fluid media on which the organism has been grown in artificial culture, which have been freed by filtration from the bacilli. When the filtrate has been concentrated it is known as ‘old tuberculin’; its potency is measured by comparison with that of the standard preparation.

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