Podcast
Questions and Answers
A positive skin test result indicates previous infection by the organism but not necessarily active ______.
A positive skin test result indicates previous infection by the organism but not necessarily active ______.
disease
The tuberculin test becomes positive 4 to 6 weeks after ______.
The tuberculin test becomes positive 4 to 6 weeks after ______.
infection
Immunization with bacillus Calmette-Guérin (BCG) vaccine can cause a positive test, but the reactions are usually only 5 to 10 mm and tend to decrease with ______.
Immunization with bacillus Calmette-Guérin (BCG) vaccine can cause a positive test, but the reactions are usually only 5 to 10 mm and tend to decrease with ______.
time
A positive skin test result always indicates active disease caused by the organism.
A positive skin test result always indicates active disease caused by the organism.
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Immunization with BCG vaccine never causes a positive tuberculin test.
Immunization with BCG vaccine never causes a positive tuberculin test.
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A PPD reaction of 15 mm or more always indicates infection with M. tuberculosis, regardless of BCG vaccination.
A PPD reaction of 15 mm or more always indicates infection with M. tuberculosis, regardless of BCG vaccination.
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Study Notes
Tuberculin Test Results
- A positive skin test result indicates previous infection by the organism, but not necessarily active disease.
- The tuberculin test becomes positive 4 to 6 weeks after infection.
- Immunization with BCG vaccine can cause a positive test, with reactions usually only 5 to 10 mm, and tend to decrease with time.
- A PPD reaction of 15 mm or more does not always indicate infection with M. tuberculosis, especially in individuals with BCG vaccination.
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Description
Test your knowledge about the tuberculin skin test and its interpretation. Learn about the factors that can affect the test results, including the impact of bacillus Calmette-Guérin (BCG) vaccine on the test. Understand the significance of different reaction sizes in determining M. tuberculosis infection.