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.
The test is done by putting a small amount of TB protein (antigens) under the top layer of skin on your inner forearm. If you have ever been exposed to the TB bacteria (Mycobacterium tuberculosis), your skin will react to the antigens by developing a firm red bump at the site within 2 days.The TB antigens used in a tuberculin skin test are called purified protein derivative (PPD). tuberculin skin test is done to find people who have tuberculosis (TB), including: 1  People who have been in close contact with someone known to have TB. 2  Health care workers who are likely to be exposed to TB. 3  People with TB symptoms, such as an ongoing cough, night sweats, and unexplained weight loss.