BSIP, LAURENT / EVE HOP AMER / SCIENCE PHOTO LIBRARY BSIP, LAURENT / EVE HOP AMER / SCIENCE PHOTO LIBRARY
Vaccination. Nurse injecting a vaccine into a child's arm. Vaccination provides protection against a disease by sensitising the immune system to the causative agent. The injection contains dead or weakened versions of the organisms which cause the disease. The body produces white blood cells to specifically attack these organisms, which quickly destroy them. In the future, if the same organisms enter the body, the immune system is already ready to deal with them, and the disease is fought off before serious symptoms occur.
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