Question

how do vaccine work answer in short

Answer 1

they penetrate the harmful pathogens, and with some support from the white blood cells, they destroy it

Answer 2

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.