Question

what is vaccine how it 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

vaccine are dead or weakened microorganisms that are introduced in the body.The weakened microorganisms do not harm the body.They induce the formation of antibodies that fight against diseases and develop immunity.This process is called vaccination.Vaccine have been developed against cholera, smallpox,cough,whooping.etc