Patient zero
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Patient Zero is the first human infected by a new or recently discovered viral or [bacterial] [outbreak]. They usually have the most basic, least mutated form of the disease, which may either make them [invaluable] to medical efforts or completely useless. They can also often be used to determine where the disease came from.
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the first person to be infected during an epidemic (= the appearance of a particular disease in a large number of people at the same time) :
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