In a health monitoring program for a mouse facility, what arrangement best describes how it should be implemented?

• A. Regular testing of sentinel animals or environmental samples to detect pathogens early.
• B. Only monthly cage inspections.
• C. Annual vaccination of mice.
• D. Random testing without action plans.

Answer: (A)

Regular, proactive surveillance using sentinel animals or environmental samples is the foundation of a health monitoring program. By routinely testing sentinel animals that share the colony or by sampling the facility environment (such as cages, bedding, water lines, or exhaust air) for pathogens, you can detect infections early—often before symptoms appear or before they spread widely. This early detection makes it possible to act quickly to contain any problems, implement quarantine or enhanced biosecurity measures, and prevent a broader outbreak, all while tracking the health status of the colony over time.

Relying only on monthly cage inspections misses subclinical infections and environmental contamination that tests can reveal, so it’s not sufficient by itself. Vaccinating annually doesn’t replace surveillance and isn’t a reliable method for monitoring colony health—many pathogens lack vaccines, and vaccines can complicate interpretation of health data. Testing at random without a defined action plan fails to provide a structured, timely response, allowing potential outbreaks to go unchecked.