6 Questions
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 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.
False
Immunization with BCG vaccine never causes a positive tuberculin test.
False
A PPD reaction of 15 mm or more always indicates infection with M. tuberculosis, regardless of BCG vaccination.
True
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.
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.
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