Vaccines and Immunoprophylaxis · USMLE Step 1

A 6-month-old infant receives the Haemophilus influenzae type b (Hib) vaccine. What type of vaccine is this?

  1. Toxoid
  2. Polysaccharide only
  3. Conjugate vaccine
  4. Live attenuated
Show answer and explanation

Correct answer: Conjugate vaccine

Hib vaccine is a polysaccharide conjugated to a protein carrier. This enhances T-cell–dependent immunity in infants.

Difficulty: Medium Question 3 of 20

Practice all 20 Vaccines and Immunoprophylaxis questions

Keep practicing

More Vaccines and Immunoprophylaxis questions