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A health care worker conducts a COVID-19 test at a clinic in Montreal, on May 10, 2020.Graham Hughes/The Canadian Press

Quebec is reducing the mandatory isolation period required for people infected with COVID-19 from 14 days to 10 because health officials felt it wasn’t right to keep people home longer than necessary, the province’s top doctor said Friday.

Horacio Arruda, director of public health, said the country’s hardest-hit province waited longer than other places before shortening the isolation period out of a desire to be cautious.

“If we think that in 10 days there’s no danger for others,” he told reporters, “we won’t leave people who have been sick for more days at home when it’s not necessary.”

The Health Department said the change is in response to evolving science regarding the transmission and the duration of contagiousness of the novel coronavirus.

Premier François Legault said Friday the announcement brings Quebec in line with other jurisdictions in Canada and around the world.

“The knowledge of specialists evolves,” Mr. Legault told a news conference in L’Assomption, northeast of Montreal. “I’m not a specialist, but I saw over the past weeks that many areas in Canada and abroad have gone from 14 to 10 days.”

From now on, people can end their isolation period 10 days after their first symptoms appear, or 10 days after testing positive for COVID-19 if they don’t show symptoms.

Authorities added, however, that people must also meet other criteria to end their isolation after 10 days, including having no fever for at least 48 hours and having no symptoms for at least a day – other than coughing or loss of taste.

The new rules apply only to confirmed COVID-19 cases involving people who are isolated at home and whose symptoms are considered mild or moderate. People who are in preventive isolation after being in contact with a confirmed case must still isolate for 14 days to see if symptoms develop.

Those who are immunocompromised or who require hospitalization for COVID-19 will still need to isolate for at least 14 days.

Speaking in Ottawa, Canada’s chief public health officer said Friday the new directive in Quebec aligns with existing federal guidelines regarding isolation that have already been adopted by several other jurisdictions.

“Our recommendation is, based on the evolving science, those who have experienced 10 days post onset of symptoms, asymptomatic, no fever, can come out of the actual isolation,” Theresa Tam said.

She said that out of caution, some provinces including Quebec chose to impose the same 14-day period that is required for people who are quarantining to see if symptoms develop.

British Columbia and Alberta have already been using the 10-day minimum period for self-isolation, according to their respective health department websites. New Brunswick, Nova Scotia and Newfoundland require 14 days, as does Ontario, according to the website for Ottawa’s public health department.

The new rules for Quebec come as more than 20 teachers from a high school northwest of Montreal were sent into preventive isolation, forcing the school to ask some 500 Grade 10 and 11 students to stay home Friday because there was no one available to teach them.

Spokeswoman Anik Gagnon said the decision was made after two members of the teaching staff at Polyvalente Deux-Montagnes tested positive for COVID-19 prior to the first day of classes.

She said the students were asked to stay home until Monday while the school tries to recruit substitute teachers or explores other options to overcome the lack of personnel. The 20 teachers will be in isolation until Sept. 4, and will all be tested for COVID-19.

Sylvain Mallette, president of a federation of teachers’ unions, the Fédération autonome de l’enseignement, says the incident highlights the need for schools to have access to an accelerated testing process.

“The question is, how long did it take to get access to a test, and how long to get the results of the test?” Mr. Mallette said in an interview Friday. He said the Quebec government hasn’t followed through on a promise to offer teachers quicker access to tests and to results.

Meanwhile, Quebec reported 98 new cases of COVID-19 Friday and one additional death attributed to the novel coronavirus.

The number of total deaths remained unchanged, however, at 5,750, after an investigation that showed one previous death attributed to COVID-19 was found to be unrelated.

Health authorities also announced Friday that 78 test results were confirmed as false positives owing to a contamination of samples in a Montreal lab. That’s almost double the number of cases that were originally under investigation when news of the contamination was announced Wednesday.

Health officials said those cases would be gradually removed from the province’s total case numbers, which stood at 62,124 on Friday.

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