Which option correctly describes the purpose of sentinel testing in a mouse facility's health monitoring program?

• A. To train staff on PPE.
• B. To reduce the number of animals in studies.
• C. To determine fur color.
• D. Regular testing of sentinel animals or environmental samples to detect pathogens early.

Answer: (D)

Sentinel testing is a surveillance approach used to monitor colony health by regularly checking sentinel animals or environmental samples for pathogens. In a mouse facility, sentinel animals or environmental debris like cage swabs are tested on a routine schedule to detect infections that might be present at low levels before they spread. This early detection allows prompt actions—such as isolating affected groups, enhancing cleaning, and adjusting husbandry practices—to protect the rest of the colony and maintain the integrity of research. Training staff on PPE, reducing the number of animals in studies, or assessing fur color do not serve the purpose of monitoring for pathogens and preventing disease spread, so they don’t fit as sentinel health monitoring methods.