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.
Antibody tests (Rapid tests) â give a positive result based on antibodies to HIV, not the virus itself. 1  2-8 weeks (up to 2 months) after infection, most people will have enough antibodies to test positive. 2  12 weeks (3 months) after infection, about 97% of people will have enough antibodies to test positive.here's a period of time after a person is infected during which they won't test positive. This is called the âhiv window period.â. The window period can be from 9 days to 3-6 months, depending on the person's body and on the HIV-test that's used.