What must a quarantine confinement chamber be enclosed upon?

A quarantine confinement chamber is critical for isolating animals that may pose a health risk due to infectious disease or other concerns. For a chamber to effectively function, it must be secure and prevent any potential escape or exposure to other animals and the environment.

The requirement for a chamber to be enclosed on all sides except the top is important for several reasons. An open-top design allows for adequate ventilation, which is essential for the wellbeing of the quarantined animals. It helps in regulating temperature and humidity levels within the chamber, reducing stress on the animals. Additionally, the topless configuration may also assist in monitoring the animals without causing them undue stress or disturbance.

Thus, the correct response emphasizes that while the sides must be secure to contain the animals safely and effectively, the top openness serves critical health and welfare needs.