Immune-based tests for tuberculosis

• INTRODUCTION • TUBERCULIN SKIN TESTING • INTRODUCTION • TECHNICAL ASPECTS OF TUBERCULIN SKIN TESTING • Administration of the test • Reading the test • Adverse reactions • INTERPRETING THE TST: FALSE-NEGATIVE AND FALSE-POSITIVE REACTIONS • False-negative tests • False-positive tests: BCG vaccination • False-positive tests: non-tuberculous mycobacteria • INTERPRETING THE TST – THINKING IN 3D • The first dimension: size • The second dimension: predictive value of a positive initial tuberculin test