. It is necessary to take vaccine against some diseases. give scientific reason
Answers
Answer:
We often develop lifelong immunity when we have had a disease. However, some diseases may lead to serious complications and sometimes death. The aim of vaccination is to obtain this immunity without any of the risks of having the disease.
When we vaccinate, we activate the immune system's "memory." During vaccination, a weakened microbe, a fragment, or something that resembles it, is added to the body. The immune system is then activated without us becoming sick. Some dangerous infectious diseases can be prevented in a simple and effective way. For some diseases, vaccination provides lifelong protection, while for others the effect is diminished after a few years and booster doses are required.
Explanation:
in short A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and effective way.