Vaccines and their role · NCERT Biology

Which of the following is a characteristic of 'Third Generation' vaccines?

  1. They use whole killed pathogens
  2. They consist of pure DNA (DNA vaccines)
  3. They use weakened live pathogens
  4. They are only administered via the oral route
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Correct answer: They consist of pure DNA (DNA vaccines)

Third-generation vaccines (DNA vaccines) involve injecting a plasmid carrying the gene for the pathogen's antigen directly into the host. The host's cells then express the antigen, triggering both humoral and cell-mediated immune responses — a significant advantage over earlier vaccine generations.

Difficulty: Medium Question 13 of 20

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