Why do vaccines prevent diseases?
Show answer & explanation
Answer: They train your immune system
Vaccines block infection entry — Wrong. Vaccines don't create physical barriers. They prepare your immune system to fight infections that enter.
They strengthen all cells — Wrong. Vaccines don't strengthen all cells. They specifically train immune cells to recognize certain threats.
They train your immune system ✓ — Correct! Vaccines contain harmless pieces or weakened forms of germs. Your immune system learns to recognize them and creates antibodies. If the real germ appears later, your body is ready to fight it fast!
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