Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The initial patient in the population of an epidemiological investigation.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Originally patient O (standing for out of California), referring to Gaëtan Dugas, a superspreader of AIDS. The letter O was later misinterpreted as a zero.

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