This kind of benevolent shelter can make the growing seasons longer for plants like lettuce that tend to bolt in the heat. And with the rise in average temperatures worldwide there may well be more room now to embrace the shade/edible connection.
The Mantoux test or Mendel-Mantoux test (also known as the Mantoux screening test, tuberculin sensitivity test, Pirquet test, or PPD test for purified protein derivative) is a screening tool for tuberculosis (TB).
Two-Step TB Skin Test. The 2-step test is not the usual PPD skin test in which you receive an injection of PPD and the test area is observed one time at a specific time frame. The 2-step PPD test is used to detect individuals with past TB infections who now have diminished skin test reactivity.