In rooms using microisolation cages, sentinels are housed in cages that contain ______ from other cages in the room.

In rooms using microisolation cages, sentinels are housed in cages that contain ______ from other cages in the room.

• A. mixed bedding
• B. used water bottles
• C. neonates
• D. soiled enrichment devices

Answer: (A)

In microisolation room setups, sentinels are exposed to potential pathogens through the bedding rather than through direct contact with colony animals. The cages housing sentinels contain mixed bedding from other cages in the room. This bedding-based exposure transfers any microorganisms present on used bedding to the sentinel animals, allowing health monitoring (serology, PCR, etc.) without compromising the containment provided by microisolators. Using mixed bedding as the exposure route is standard because it provides a consistent, indirect route for surveillance while minimizing other confounding exposures. Other options don’t reliably provide this exposure route: used water bottles aren’t a controlled or reliable method for sentinel exposure; neonates aren’t used for sentinel exposure; and soiled enrichment devices aren’t part of the sentinel exposure protocol.

In microisolation room setups, sentinels are exposed to potential pathogens through the bedding rather than through direct contact with colony animals. The cages housing sentinels contain mixed bedding from other cages in the room. This bedding-based exposure transfers any microorganisms present on used bedding to the sentinel animals, allowing health monitoring (serology, PCR, etc.) without compromising the containment provided by microisolators. Using mixed bedding as the exposure route is standard because it provides a consistent, indirect route for surveillance while minimizing other confounding exposures. Other options don’t reliably provide this exposure route: used water bottles aren’t a controlled or reliable method for sentinel exposure; neonates aren’t used for sentinel exposure; and soiled enrichment devices aren’t part of the sentinel exposure protocol.