This represents the toxins of the tubercle bacillus

Properties : Tuberculin is marketed in a variety of forms, either as a filtered extract of the bacilli or as the pulverized insoluble substance of the dead bacilli themselves. In the latter or emulsified form tuberculin is known as tubercle vaccine, and it is closely related to bacterial vaccines mentioned under Vaccina.

Action and Uses: Tuberculin is used principally as a diagnostic agent and the characteristic properties of the trade product to be used should be studied closely before it is employed.