index patient

/IH1 N D EH0 K S P EY0 SH AH0 N T/
noun
  1. 1

    The first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation; the case of patient zero.

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Source: https://en.wiktionary.org/wiki/index%20case, https://en.wiktionary.org/wiki/index%20patient