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Your immune system defends your body against germs such as viruses and bacteria. When it meets a new germ, it takes time to learn how to fight it, and you may get sick in the meantime.
A vaccine gives the immune system a safe preview. It contains a weakened or inactivated germ, a harmless piece of a germ, or instructions that teach cells to make that harmless piece. The immune system responds by making antibodies and memory cells.
If the real germ later enters the body, the memory cells recognize it and the immune system responds quickly, often stopping the infection before it causes serious illness.
When many people in a community are vaccinated, germs have trouble spreading. This "community immunity" helps protect people who cannot be vaccinated, such as newborns.
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Worksheets › Grade 8 English › Reading Informational Text › Reading Informational Text
Free Grade 8 English worksheet (Common Core RI.8.1): read the informational text "How Vaccines Train the Immune System", find the main idea and answer questions with evidence. Skill: Key ideas and details in informational text. Level: Grade 8 — also suits Year 9 (UK).
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It is designed for Grade 8 (ages 13–14), but use it with any child who is ready.
Key ideas and details in informational text.
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