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Vaccines are medical tools that protect our bodies from diseases and strengthen our immune system. They contain weakened or inactivated forms of disease-causing microbes. This allows our bodies to recognize these microbes and prepare defenses to eliminate them. What Is the Immune System? The immune system is the body’s defense mechanism that protects us from disease-causing microbes entering from outside. It fights harmful microbes that enter the body and prevents us from becoming ill. How Do Va