Toronto Public Health sent a letter to staff and students at an adult ESL education centre at Yonge and Eglinton, warning that “they may have been exposed” to someone infected with the novel coronavirus.

The letter dated Thursday stated that the individual last attended the Language Instruction for Newcomers to Canada (LINC) centre at 90 Eglinton Ave. E. on Feb. 25 and did not have symptoms that day.

The school “chose to do a deep cleaning on their own” of the facility Thursday evening, Toronto Public Health associate medical officer of health Dr. Vinita Dubey told the Star on Saturday.

Students and staff are urged in the letter to call Toronto Public Health and follow self-isolation procedures if they develop symptoms on, or before, March 11.

Symptoms of COVID-19 — which include fever, cough, sore throat and pneumonia — may develop “in as few as two days or as long as 14 days,” the letter said.

“Coronaviruses are spread mainly from person-to-person between people who are in close contact with one another. People who are thought to be most contagious when they are most symptomatic (e.g. when they are the sickest).”

Dubey said that sharing information is “part of our routine work for all public health investigations related to communicable diseases.”

“Sometimes, as part of the process, we share information with people through letters of notification like this recent example,” Dubey said in an email Saturday to the Star.

“This is the work we do each and every day and not just for COVID-19. We do this to provide education, further instructions and to reduce the potential of virus spread.”

Toronto Public Health officials were present at the centre Thursday to answer questions and discuss “proper infection prevention and control strategies including having available hand sanitizer for students.”

There have been 11 confirmed cases of COVID-19 in Ontario. Three of the patients have recovered. Seven of the cases came in the last four days.

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On Feb. 26, a Toronto woman in her 60s who had returned from Iran had tested positive for the virus. The following day, her husband had also tested positive. He had not visited Iran. It was the first case of person-to-person contact in Ontario.

On Friday, Ontario health officials reported that a man in his 50s who had travelled to Iran had tested positive for the virus in Toronto. Later Friday night, officials reported that a Toronto man in his 80s with a travel history to Egypt, tested positive.

On Saturday, officials announced three new cases of the virus. A 34-year-old woman tested positive in Richmond Hill. A 51-year-old woman and her 69-year-old husband also tested positive in Ajax. Both of the women had travel history to Iran, while the man didn’t go.