This audit focused on whether the Public Health Agency of Canada improved its administration of mandatory quarantine orders to limit the introduction of the virus that causes COVID‑19 and the virus variants into Canada from 1 July 2020 to 30 June 2021, the period beginning after the conclusion of our previous audit on this topic. The audit also focused on how the agency implemented and enforced the following additional border control measures introduced in early 2021: COVID‑19 testing for travellers entering Canada, and quarantine of air travellers at government-authorized hotels pending the results of their on‑arrival COVID‑19 tests.