The quarantine space is extremely limited making control of the influx of animals imperative. We limit the opportunity for exposure to dangerous pathogens to the facility by grouping shipments together and moving them out enmasse if testing is negative. A single negative sentinel result does not mean that an infection has been cleared from a room. The health history in a room is an accumulation of data over time. We always provide the last 4 sentinel surveys on health reports to receiving institutions so that we do not inadvertantly expose other facilities to unwanted pathogens.
Sentinel programs are sometimes insensitive indicators of a room's health status.