Why is quarantine of new mice important before integrating into an established colony?

• A. To train staff in handling new arrivals.
• B. To quickly integrate with existing animals.
• C. To prevent introduction of pathogens and to assess health status before exposure.
• D. To reduce breeding opportunities during quarantine.

Answer: (C)

Quarantine isolates new mice so their health can be checked and potential pathogens are kept from spreading to the established colony. During this period, animals are closely observed for signs of illness and may undergo health screening such as clinical exams and tests for infectious agents or parasites. If a problem is found, actions can be taken without risking the rest of the group, protecting both animal welfare and the integrity of ongoing studies. The other options miss the primary purpose: staff handling is important but separate from health screening, quick integration would increase risk of spreading disease, and reducing breeding isn’t the main reason for quarantine.