Stem-and-Leaf plot is a method of organizing numerical data in order of place value. The 'ones digit' and the 'tens digit and greater' of each data item is separated as leaves and stems respectively. The stem-and-leaf plot below shows the number of students enrolled in a dance class in the past 12 years.
Vaccination with live viruses may interfere with TST reactions. For persons scheduled to receive a TST, testing should be done as follows: Either on the same day as vaccination with live-virus vaccine or 4-6 weeks after the administration of the live-virus vaccine. At least one month after smallpox vaccination.
There are two tests that can be used to help detect TB infection. The Mantoux TB skin test is performed by injecting a small amount of fluid (called PPD tuberculin) into the skin in the lower part of the arm. If you get the TB skin test, you have to return within 48 to 72 hours to have a trained health care worker look for a reaction (bump) on your arm.