Index case

The index case (occasionally referred to as patient zero) is the first patient in a disease epidemic within a large population,[1] or the first documented patient included in an epidemiological study.[2]

References

  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. "WordNet Search – 3.0". Princeton University, wordnetweb.princeton.edu. Retrieved 3 November 2010.