Vaccination is the administration of a vaccine to help the
immune system develop protection from a disease.
Vaccines contain a microorganism or
virus in a weakened, live or killed state, or proteins or toxins from the organism. The most common and serious vaccine-preventable diseases tracked by the World
Health Organization (WHO) are: diphtheria, Haemophilus influenzae serotype b infection,
hepatitis B, measles, meningitis, mumps, pertussis, poliomyelitis, rubella, tetanus, tuberculosis, and yellow fever.
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