The province reported 88 cases Wednesday, 100 Tuesday, 105 Monday and 115 Sunday.
This is the strongest daily growth in cases since August 20, when 131 cases were reported.
“Locally, 28 of Ontario’s 34 public health units are reporting five or fewer cases, and 18 have not reported any new cases,” Health Minister Christine Elliott wrote on Twitter.
Seventy-seven people have recovered from their infections in the past 24 hours, resulting in a net increase of 40 active cases in Ontario.
There are now 1,070 active cases of novel coronavirus infection in the province, up from about earlier this month.
There have been 41,813 laboratory-confirmed cases of infection since January 25, as well as 2,803 deaths and 37,940 recoveries.
Sixty-eight percent of cases detected in the past 24 hours have been in people aged 39 or younger.
Toronto reported 36 new infections, Peel Region reported 19, Ottawa 22 new cases and Durham Region 10.
Provincial labs processed 28,600 tests in the past 24 hours, up from about 22,000 processed a day earlier.
26,000 other test specimens remain under investigation.
The positivity rate generated by Thursday’s results is 0.41%.
Meanwhile, the number of people hospitalized with symptoms of COVID-19 continues to slowly climb.
There are now 48 people in Ontario hospitals receiving treatment, up from at least 43 on Wednesday.
Of that number, 18 people are in intensive care units, up from 15 on Wednesday.
Ten people breathe using a ventilator, unchanged from Wednesday.