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A wide variety of pathogens may live on or in the human body

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A wide variety of pathogens may live on or in the human body. A Bacteria on the tip of a pin. B Trypanosoma brucei, microscopic protozoan that causes African sleeping sickness—a disease that afflicts millions of people in Africa. It is shown next to a red blood cell. C The SARS virus, which causes an emerging respiratory disease.
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