In a research colony, the health status of the colony is monitored by the testing of which animals?

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Sentinels are animals that are specifically placed in the colony for the purpose of monitoring the health status of the colony. These animals are usually healthy and are tested regularly for any signs of illness or disease. Testing random animals from the colony may not provide an accurate representation of the overall health status of the colony, and testing only sick animals may be reactive rather than proactive in addressing potential issues within the colony. Controls are used in scientific research to serve as a comparison group, but they may not necessarily be the best choice for monitoring the health of a colony.

In a Research Colony, the Health Status of the Colony