French

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French Wikipedia has an article on:
Wikipedia fr

Pronunciation

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  • IPA(key): /pa.sjɑ̃ ze.ʁo/
  • Audio:(file)

Noun

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patient zéro m (plural patients zéro)

  1. (epidemiology) patient zero, index case (the first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation)