What is Vaccine?

Vaccine meaning A substance or group of substances meant to cause the immune system to respond to a tumor or to microorganisms, such as bacteria or viruses. A vaccine can help the body recognize and destroy cancer cells or microorganisms.


reference: national Cancer Institute – Glossary for Registrars



What is Vaccine ?

Vaccine is (noun) a substance which contains the germs of a disease and which is injected into a patient to prevent him or her from catching the disease


source: Easier English, Student Dictionary Upper Intermediate Level