Question

(b) What is a ‘vaccine’? Explain the principle on which it works.

Hint:

Vaccines mimic infections, enabling the immune system to recognize and combat real pathogens effectively in the future.

Answer 1

- Definition: A vaccine is a biological preparation that confers active immunity to particular diseases.
- Principle: Vaccines function by prompting the immune system to generate antibodies against the pathogen responsible for a disease, without inducing the disease. This prepares the body to combat the actual pathogen upon future exposure.