quarantine facility
A facility where people or animals are kept in isolation to prevent the spread of disease. Often used in medical, public health, and travel contexts.
People returning from overseas had to spend two weeks at a quarantine facility near the airport.
隔離施設 is a broader term for any isolation facility, while 待機施設 specifically implies waiting or standby for quarantine purposes.
Compound of 待機 (standby, waiting) and 施設 (facility). The term gained prominence during the COVID-19 pandemic for facilities used to isolate arriving travelers.