MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Tetanus vaccine being injected into a schoolgirl's upper arm. Several doses are given in childhood to immunize against the disease. Tetanus is caused by Clostridium tetani bacteria, which produce a toxin that acts on nerves controlling muscle activity. Painful muscle spasms occur which may be fatal. Photographed in Lacor, Gulu, Uganda.
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