IAN HOOTON / SCIENCE PHOTO LIBRARY IAN HOOTON / SCIENCE PHOTO LIBRARY
Vaccination. 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-organisms. Vaccination schedules for 4-month-old babies usually include booster vaccinations for hepatitis B, diphtheria, polio, whooping cough and tetanus.
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