"There's no ideal answer or solution during a pandemic", said Chief Medical Officer Eileen de Villa on Wednesday.
Durham is one of 13 more public health units opening on Monday.
Daily screening measures will also be more stringent.
An error in the data system resulted in a negative case count for Toronto on Tuesday. The province said they anticipate a fluctuation in case numbers in the following days as the data issues correct themselves.
The only three regions that will continue online learning are Toronto, Peel and York regions; those three areas will go back to in-person classes after the Family Day weekend on Tuesday, February 16, 2021. The last time that number was that low was on October 24 when the same rate was reported by the province. Tuesday's numbers saw the province dip below 1,000 for the first time since November 5. There were 64,467 tests completed in Ontario in the previous 24-hour period with a 2.6-per-cent positivity rate.
So far, Ontario has recorded 152 cases of a variant that first emerged in the United Kingdom and one case of another that first emerged in South Africa. The number of cases for any city or region may differ slightly from what is reported by the province, because local units report figures at different times.
Meanwhile, several other jurisdictions in Ontario reported new case numbers in the mid to high double digits including Hamilton, Halton and Niagara regions.
There is now a total of 273,660 confirmed cases in the province since the onset of the pandemic with 6,393 deaths. Another 1,956 cases were resolved in the previous 24-hour period. Of those patients now in hospital, 323 are in intensive care and 241 require a ventilator.