For example, up to 60 percent of severe disease caused by Haemophilus influenzae type B occurs in children under 12 months of age. Infants less than 6 months of age are at highest risk for serious complications of pertussis . 72 percent of children under 6 months who get pertussis must be hospitalized, and 84 percent of all deaths from pertussis are among children under 6 months.
The ages at which vaccines are recommended are not arbitrary. They are chosen to give children the earliest and best protection against disease.
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