MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
BCG vaccine being prepared for injection with a syringe. BCG (Bacille Calmette-Guerin) vaccine contains a weakened (attenuated) strain of bovine Mycobacterium bovis. It is injected to stimulate the body's immune system to defend against tuberculosis (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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