Index case

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.

References

↑ "Diseases – Activity 1 – Glossary, page 3 of 5". science.education.nih.gov. Archived from the original on 2017-11-10. Retrieved 2017-11-10.
↑ "WordNet Search – 3.0". Princeton University, wordnetweb.princeton.edu. Retrieved 3 November 2010.

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[1] "Diseases – Activity 1 – Glossary, page 3 of 5". science.education.nih.gov. Archived from the original on 2017-11-10. Retrieved 2017-11-10.

[:2-2] "WordNet Search – 3.0". Princeton University, wordnetweb.princeton.edu. Retrieved 3 November 2010.