ObSurv is the surveillance system established in 1996 by SCIEH for general outbreaks
of infectious intestinal disease (IID). For the purpose of ObSurv an outbreak is
defined as an incident in which two or more linked cases experience the same illness,
or when the observed number of cases unaccountably exceeds the expected number.
The system seeks information on general outbreaks, defined as outbreaks affecting
members of more than one household or residents of an institution.
Annual Reports of General Outbreaks of Infectious Intestinal Disease in Scotland