Definition of index case in English:

index case

Syllabification: in·dex case

noun

Medicine
  • The first identified case in a group of related cases of a particular communicable or heritable disease.
    More example sentences
    • All participating subjects gave written, informed consent and were interviewed about exposure to the index case and BCG vaccination status.
    • The numbers are large because we were unable to identify the index case.
    • Public health departments aren't likely to be the ones diagnosing and identifying an index case of smallpox.

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