believe that it is less reliable because the amount of tuberculin that enters the skin cannot be accurately determined, despite the aforementioned results.
* The Heaf test, a test similar to the tine test formerly used in the United Kingdom. A spring-loaded instrument with six needles is used. It stopped being used in 2005 as the manufacturer deemed the production of this instrument financially unsustainable.

Standardization

Purified protein derivative (PPD) tuberculin is a precipitate

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