On the Mycobacterium tuberculosis "skin test", what does it mean if skin is flat after two days ? The person has TB or has been given the vaccine for TB in the past The person does not have TB
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In some areas of the world, a tuberculosis vaccine known as bacillus Calmette-Guérin (BCG) is used. It is not used in the United States. Every person who has received this vaccine and mounted a protective response will have a positive reaction in a tuberculin skin test. Why? What does this mean for the usefulness of this skin test in those countries where this vaccine is used?
People are screened for tuberculosis using the tuberculin test. In this test, a protein from Mycobacterium tuberculosis is injected or scratched into the skin. If a person has active TB, latent TB, or even cured TB, they will show a positive reaction by producing a raised, allergic bump at least 10 mm in diameter. How large would this positive reaction be in inches?
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