index case

Fetched 2026-10-26 (cache).

Synonyms: index card, index cases, index page

Antonyms: index card, index cases, index page

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|epidemiology}} The first [[documented]] [[case]] in a [[disease]] [[epidemic]] within a [[population]] or the first case of interest in an [[epidemiological]] [[investigation]]: the case of [[patient zero]] (the [[index patient]]).

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.