Question

Why are pathogens used to prepare vaccines?​

Answer 1

Answer:

Vaccines are made by taking viruses or bacteria and weakening them so that they can't reproduce (or replicate) themselves very well or so that they can't replicate at all. Children given vaccines are exposed to enough of the virus or bacteria to develop immunity, but not enough to make them sick.

The aim of vaccines is to prime the body, so that when an individual is exposed to the disease-causing organism, their immune system is able to respond rapidly and at a high activity level, thereby destroying the pathogen before it causes disease and reduces the risk of spread to other people.