BSIP LAURENT / SCIENCE PHOTO LIBRARY BSIP LAURENT / SCIENCE PHOTO LIBRARY
Vaccination. Syringe and hypodermic needle used in vaccination injections. A magnified image of an infectious microorganism forms the background. Vaccines consist of dead or weakened doses of microorganisms which are injected into the body to stimulate the immune system. They provide protection against many infectious diseases. Many people are routinely vaccinated against various diseases when they are children, but booster vaccinations in adulthood are recommended for some illnesses. Vaccines may also be given in preparation for a holiday in a part of the world where particular diseases are commonplace.
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