The newly released figure, the most current available, provides a glimpse into how the federal government is using its considerable powers under the Quarantine Act in an effort to contain the virus.
The Public Health Agency of Canada says that as of Sunday night, the almost two dozen Canadians were in federally designated quarantine sites and federally supported self-quarantine lodgings.
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The agency set up the sites and says it is working with partners to manage them.
Agency spokeswoman Maryse Durette says no information about the location of the sites is being disclosed to protect the privacy of quarantined Canadians.
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Under the Quarantine Act, the health minister can designate any place in Canada as a quarantine facility.
An emergency order under the quarantine law requires all travellers returning to Canada to immediately self-isolate for 14 days. Those with symptoms must put on a mask before leaving the airport.
Compliance with the order is subject to monitoring,