Translations:Advanced Field Epi:Manual 2 - Diagnostic Tests/180/en
In the above example, increasing the cut-point number of reactors for a positive result from 1 to 2 (i.e. if there are 0 or 1 animals test positive the group is considered "uninfected" while if 2 or more test positive it is infected) results in an increase in SpH to 74% but a reduction in SeH to 77% (from EpiTools: http://epitools.ausvet.com.au/content.php?page=HerdSens3).