What is the main goal of maintaining sentinels in animal rooms?

• A. To identify the pathogens present in newly received animals
• B. To protect the colonies from infection
• C. To allow early detection of infection affecting the colony
• D. To provide animals that can be used as alternates in case of death of experimental animals

Answer: (C)

The main idea is to have an early warning system for infections that could threaten the whole colony. In a sentinel program, healthy, disease-free animals are exposed to the same environmental factors and materials as the rest of the colony—often through soiled bedding or shared housing—so they reflect any pathogens circulating in the facility. These sentinel animals are periodically tested, and if infection is detected, staff can act quickly to quarantine, enhance sanitation, revise procedures, or take other measures to prevent a full-blown outbreak. This approach focuses on catching problems early before clinical signs appear in the colony, which is why it’s the best description of the goal.

This isn’t about identifying pathogens in newly received animals themselves, nor is it primarily about providing backup animals for experiments. While sentinel monitoring ultimately helps protect the colony, the core purpose is the early detection and rapid response it enables.