Chapter 18, Problem 3MC

Summary Introduction

Introduction:

A vaccine is defined as a preparation of bacterial, viral, or other pathogenic agents or their isolated peptides, which is administered with the objective of eliciting the recipient’s immunity. An encounter with the antigen activates the immune system and results in theproduction of specific antibodies and memory cells. Thus, itprovides active immunity to the body as immune response is elicited after exposure to antigen.