noun
- The earliest documented case of a disease that is included in an epidemiological study. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). index case. Retrieved September 23, 2026, from http://smartdefine.org/index_case/definitions/1324578 |
| Chicago | WordNet. 2010. "index case" http://smartdefine.org/index_case/definitions/1324578 (accessed September 23, 2026). |
| Harvard | WordNet 2010, index case, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/index_case/definitions/1324578>. |
| MLA | WordNet. "index case" 23 October 2010. Web. 23 September 2026. <http://smartdefine.org/index_case/definitions/1324578> |