Lecturer
•A vaccine is a substance that is introduced into the body to prevent infection or to control disease due to a certain pathogen, which is a disease-causing organism, such as a virus, bacteria or parasite.
•The vaccine “teaches” the body how to defend itself against the pathogen by creating an immune response.
•vaccine is a biological preparation that provides active acquured immunity to a particular infectious disease by introducing a small component or a nonharmful form of the pathogen (called the foreign antigen) into the body.
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