Ontario is reporting 4,456 new COVID-19 cases across the province, marking a new single-day high for new infections.
The latest figures released Sunday morning show 21 additional deaths associated with the virus and a sharp rise of new cases in Toronto, which jumped by nearly 400 to 1,353.
Health Minister Christine Elliott says there were 860 in Peel Region and 444 in York Region over the past 24 hours.
Ottawa and Durham Region logged daily counts of 377 and 329, respectively.
Government figures show 1,513 patients currently in Ontario hospitals due to COVID-19, with 605 in intensive care and 382 on a ventilator.
A total of 3,139,743 vaccine doses have been administered in Ontario so far.
The province completed 56,378 tests since the last report.