25.4 MB (1.2 MB compressed)
3668 x 2420 pixels
31.0 x 20.6 cm ⏐ 12.2 x 8.1 in (300dpi)
BSIP, KEENE / SCIENCE PHOTO LIBRARY BSIP, KEENE / SCIENCE PHOTO LIBRARY
Tuberculosis vaccine test. Medical worker performing a test on a woman to see if she has immunity to tuberculosis. A protein extracted from the tuberculosis (TB) bacteria (Mycobacterium tuberculosis) is being applied to the skin. After 3-10 days the area is examined to see if there has been any reaction. A positive result (inflamed and red skin) means that the patient has antibodies to protect against TB. These will have been acquired either through infection or vaccination. If the result is negative, the patient is given a vaccine against TB, such as the BCG vaccine. TB is an infectious and debilitating lung disease that is sometimes fatal. Photographed in France.
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