BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
Vaccination. Doctor using a syringe to inject a vaccine into a child's arm. Vaccination provides long-term protection against a range of infectious diseases. The injection of a killed or weakened micro-organism causes the response of the immune system to be stronger when infections occur in the future. Many vaccinations are routinely given during childhood.
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