A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body’s immune system to recognize the agent as foreign, destroy it, and “remember” it so that the immune system can more easily recognize and destroy any of these microorganisms that it later encounters.
The below-mentioned link will give you relevant knowledge.
http://www.who.int/features/qa/84/en/
“Healthy Kids, Happy Family”
Regards
Dr. Rahul Varma
