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The index case (occasionally referred to as patient zero) is the first patient in a disease epidemic within a large population, or the first documented patient included in an epidemiological study.
- "Diseases – Activity 1 – Glossary, page 3 of 5". science.education.nih.gov. https://science.education.nih.gov/supplements/webversions/InfectiousDiseases/other/glossary/act1-gloss3.html#i.
- "WordNet Search – 3.0". Princeton University, wordnetweb.princeton.edu. http://wordnetweb.princeton.edu/perl/webwn?s=index%20case.