Question

what is immunisation?​

Answer 1

$\huge\star\underline\mathcal\purple{HELLO}$

Immunisation is the process by which an individual's immune system becomes fortified against an agent.

Answer 2

Answer:

If you had chicken pox at once there is no chance of suffering from it again. This is because when the immune system first sees the microbe it response it with great vigour the second time . this is called immunisation..