Index-case definition

The earliest identified occurrence of a disease or disorder, usually as part of an epidemiological investigation of a patient population or a genetic study of a family.
noun
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The first patient who has such a disease or disorder.
noun
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The earliest identified occurrence of a disease or disorder, usually as part of an epidemiological investigation of a patient population or a genetic study of a family.
noun
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The first patient who has such a disease or disorder.
noun
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Other Word Forms

Noun

Singular:
index-case
Plural:
index cases