Question

Q.4. What is a vaccine? How does a vaccine work?

Answer 1

Vaccines are like a training course for the immune system. They prepare the body to fight disease without exposing it to disease symptoms. When foreign invaders such as bacteria or viruses enter the body, immune cells called lymphocytes respond by producing antibodies, which are protein molecules.

Answer 2

Answer:

A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe

vaccines produce antibodies to fight and kill disease causing microorganisms..these antibodies also remember to do the same whenever the particular microbe enters the body in future, thus ensuring protection against that particular disease

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