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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
A positive result means you have been infected with TB, even if the infection is not active. If your test is positive, your health care provider will do a thorough physical exam and order an X-ray of your lungs to reveal whether the disease is active.