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To prevent a disease caused by a certain microbe, doctors inject the same microbes in a person's blood. How is it ensured that this prevents the disease instead of causing it? What is this process of injecting microbes called?

Answer» To prevent a disease caused by a certain microbe, doctors inject the same microbes in a person's blood. How is it ensured that this prevents the disease instead of causing it? What is this process of injecting microbes called?


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