TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Childhood vaccination. Doctor holding a vial containing the Act-Hib vaccine. This is a combined vaccination that provides protection against tetanus, diphtheria and pertussis (whooping cough). Vaccination provides long-term protection against infectious diseases. The vaccine contains killed or weakened disease-causing micro-organisms that prepare the body's immune system against real infections by those micro-organsims.
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