ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
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Vaccination. Doctor preparing to vaccinate a crying child. Wiping the skin with a disinfectant (as seen here) ensures that the surface where the vaccinating needle enters is sterile. Such sterilization prevents dirt and bacteria from entering the body when it is pierced by the tip of the needle. Vaccines are weakened or killed disease agents which confer long-lasting immunity against a disease. They provoke a mild immune response and immune memory when injected into the body. Many are routinely given in childhood.
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