How is full immunization from Haemophilus influenzae infection defined?

Updated: Jun 11, 2021
  • Author: Joseph Adrian L Buensalido, MD; Chief Editor: Pranatharthi Haran Chandrasekar, MBBS, MD  more...
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Full immunization is defined as having received at least one of the following [107] :

  • One dose of a Hib conjugate vaccine when at age 15 months or older
  • Two doses at age 12-14 months
  • Two or more doses at age 12 months or older
  • Three doses before age 12 months, with a booster dose at age 12 months or older

The CDC states that the recommended primary series in infants should be administered at ages 2, 4, and 6 months or ages 2 and 4 months, depending on the vaccine type used, with a booster dose at age 12-15 months. [10]


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