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Children's Dictionary
booster shot an injection of a vaccine given at some time after the first injection. A booster shot continues the protection against disease begun by the earlier injection.
immune protected from a disease, either naturally or by getting a vaccine. [1/2 definitions]
poliomyelitis a disease caused by a virus that attacks the spinal cord and damages the nervous system. Poliomyelitis affects mainly children and can lead to paralysis or deformed limbs. Jonas Salk invented a vaccine that prevents poliomyelitis.
vaccinate to give a vaccine to, so as to protect from a disease.
vaccine a substance used to protect people and animals from very serious diseases. Vaccines contain germs of a particular disease--these germs been killed or changed in a certain way in a laboratory to make them safe. A vaccine goes into a person's body in a shot that is given by a doctor or nurse. After a vaccine is put into a person's body, that person will not get that disease or will get only a mild case.