Before revision: How are they used A case definition defines a case by placing limits on time, person and URL Time criteria may include all cases of a disease identified from, for example, January 1, 2008 to March 1, 2008.
After revision: How are they used A case definition defines a case by placing limits on time, person , place, and shared definition with data collection of the phenomenon being URL Time criteria may include all cases of a disease identified from, for example, January 1, 2008 to March 1, 2008.