Why are conjugate vaccines useful for protecting young infants against certain bacterial diseases?
Correct answer: B. They link a polysaccharide antigen to a protein carrier to improve the immune response
- A. They contain a live bacterium that multiplies in the intestine
- B. They link a polysaccharide antigen to a protein carrier to improve the immune response
- C. They contain antibodies collected from an immune donor
- D. They destroy bacteria already multiplying in the child’s blood
Explanation
Conjugate vaccines link a polysaccharide antigen to a protein carrier, producing a stronger and more reliable response in young children. They prevent infection but do not act as antibiotics or provide ready-made antibodies.
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About Immunisation and EPI
Immunisation covers active and passive immunity, vaccine types, routine childhood schedules under Pakistan’s Expanded Programme on Immunization, administration routes and age-based timing. It also includes cold-chain maintenance, contraindications, adverse events following immunisation, missed doses and the distinction between vaccine protection and treatment of an established infection.
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