Question

whaat is vaccine ? how does it work​

Answer 1

A vaccine consists of weakened or dead microbes which are injected in a healthy persons body to immunise it against that kind of disease.

So in the future, the body will dtect the symptoms of that particular disease and will be able to fight it back easily.

Answer 2

Vaccines are antigens prepared from pathogenic bacteria to promote active immunity without causing disease .These have dead or weakened microorganisms. Vaccines work by inducing the formation of antibodies in the body for fighting against bacterial infection.