Tuberculosis (TB) is a disease that is spread through the air from one person to another. When someone who is sick with TB coughs, speaks, laughs, sings, or sneezes, people nearby may breathe TB bacteria into their lungs. TB usually attacks the lungs, but can also attack other parts of the body, such as the brain, spine, or kidneys.
PPD testing requires 2 visits 48-72 hours apart. You don’t have to worry if you need to have the PPD read on a weekend or a holiday.