MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Tuberculosis (TB) immune response test. Close-up of an immune system response (reddened patch) for TB on the skin of a patient's arm. An injection of tuberculin (Mantoux test) has been carried out to test for the presence of TB, an infection by the bacterium Mycobacterium tuberculosis. TB usually infects the lungs and can cause severe scarring. Once diagnosed, a TB infection is treated by a course of antibiotic drugs, often several taken in combination. If the infection is not completely eradicated, then drug-resistant forms can develop. Photographed in the UK.
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