Last Updated
：2025/12/03
index case
（ plural ）
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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
Public health officials identified the index case and immediately began contact tracing to contain the outbreak.
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Public health officials identified the index case and immediately began contact tracing to contain the outbreak.
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