Last Updated：2025/12/03

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(epidemiology) 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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index case

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index case

Noun

(epidemiology) 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.

Japanese Meaning

疫学において、集団内で最初に記録された患者、または感染伝播の起点となった症例（患者ゼロ）

What is this buttons?

Public health officials identified the index case and immediately began contact tracing to contain the outbreak.

Google Translation / DeepL Translation

公衆衛生当局は最初に確認された患者を特定し、直ちに接触者追跡を開始して流行の抑制に努めた。

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Sense（1）

(epidemiology) 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.

index cases

（ plural ）

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index case

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