Quarantine is the separation and restriction of movement of people who have been exposed to a contagious disease but may not yet be sick, to prevent potential spread to others. This differs from isolation, which separates people who are confirmed ill. Quarantine became widely discussed during COVID-19, with requirements for travellers and close contacts of confirmed cases. Federal quarantine powers apply at borders under the Quarantine Act, while provinces have authority over quarantine within their jurisdictions. Municipal public health units often implement and monitor quarantine requirements. Effective quarantine depends on support services enabling people to stay home, including income support and delivery of necessities.