The most common method to detect exposure to M. tuberculosis is a skin test. The Mantoux test, which involves the intracutaneous injection of 0.1 mL of PPD in the forearm, relies on a delayed-type hypersensitivity reaction that is triggered if past exposure to tuberculosis has occurred. The test is read between 48 and 72 h after administration by measuring the extent of skin induration at the test site. Erythema or other skin changes are not assessed. Table Bi-^ summarizes the American Thoracic Society's standards for interpretation of test results.15 All persons with a positive PPD reaction or recent conversion should be referred for possible preventive therapy.
Was this article helpful?
Rosacea and Eczema are two skin conditions that are fairly commonly found throughout the world. Each of them is characterized by different features, and can be both discomfiting as well as result in undesirable appearance features. In a nutshell, theyre problems that many would want to deal with.