On March 28, Saskatchewan announced the largest single-day increase in cases, at 30. The spike, especially in northern and central Saskatchewan, was attributed to 18 cases involving attendees of a snowmobile rally in Christopher Lake on March 14.[17][18] The Saskatchewan Health Authority (SHA) initially announced two positive cases (including a participant, and a server at an associated dinner) on March 25, and has advised self-isolation for anyone who had attended.[19][20]