Question

What is vaccines and how they work in a body?

Answer 1

vaccines are an antigenic  substance prepared from the causative agent  of a disease or a synthetic substitute , used to provide immunity against one or several diseases.

Answer 2

Answer:

A biological preparation that provides immunity to a particular disease is called VACCINE

1. Injecting a vaccine,develops the production of specific antibodies.
2. when the pathogen enters our body,the antibodies which are developed already will fight and eliminate them(disease causing microorganisms).
3. Thus the disease is prevented.

HOPE IT HELPS :)