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infection is when a certain area on the body is attacked by bacteria. immunity is when your body knows a certain virus, and knows the best ways to fight it. if you survive an infection, your body remembers whatever virus or bacteria that caused the infection. you become immune. with this knowledge, doctors give vaccinations, which are actually the weakened virus cells of sicknesses, so the body can easily fight them off when and if they catch the ailment outside of the hospital.

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