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2026-08-25 09:21:58 -

Why Standardizing Tuberculin PPD Is More Than Measuring Protein Content

Tuberculin purified protein derivative (PPD) is not a single purified protein with one defined molecular identity. It is a complex preparation containing multiple components derived from Mycobacterium tuberculosis. This composition makes its standardization different from that of a conventional recombinant protein, where concentration and molecular identity can provide relatively direct...

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