"Due to lack of information of who attended the event and the inability to consult directly with those students, the risk to the school community can not be adequately assessed", he said, bringing officials to delay a plan to return all students on Tuesday.
The case was confirmed in a school-wide letter to parents Monday morning.
Other family members of the close contacts are not required to quarantine unless the close contact develops symptoms.
A premier MA high school quickly dropped strategies to bring trainees back to class on Monday after authorities separated a large celebration that lots participated in over the weekend.
Assuming the students involved were more likely juniors or seniors, Wong said she asked the board if just freshmen and sophomores could learn partially in-person, though her request was denied.
Staff still plan to connect with students before September 18 to make sure the right technology is in place.
It said it continues to distribute computers and other devices to students this week.
"We hope the additional days are available to high school teachers exclusively for them to prepare to welcome and teach their students".
"We believe that the administrator who tested positive for COVID-19 was exposed outside of the school setting".
"A lot of work went into getting ready for this fall, but it has really paid off", she said.
Toronto District School Board trustee Shelley Laskin said on Twitter the health screening process has also changed leading up to the return to class.
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