Correction: A family member of a St. Mary’s staff member was in contact with someone who tested positive for the coronavirus.

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An Arlington elementary school has been closed after a student’s parent was exposed to and has tested positive for the new coronavirus, and a Worcester school will close Monday after a family member of one of the school’s staff was in contact with someone who tested positive for the coronavirus.

Arlington officials closed The Stratton School and St. Mary’s School in Worcester will not hold classes Monday.

Arlington town officials were notified that a woman in her 40’s who attended a Biogen employee conference last week has since tested positive for the virus. Her child is also being tested after showing some of the symptoms of the infection. The results of that test have not come back yet.

“We are ever-mindful of childcare needs and family schedules, however, we are faced with a challenging and uncertain situation,” School Superintendent Kathleen Brodie said in a release. “Without test results in hand and with a parent who has tested positive for Coronavirus, the leadership team in Arlington unanimously feels that it is best to close the Stratton School on Monday and re-evaluate during the day.”

In Worcester, This Week in Worcester.com reported that school officials decided to close St. Mary’s, a Pre-K through grade 12 school on Richland Street, after they were notified that a family member of one of the school’s staff was in contact with someone who tested positive for the coronavirus. Neither the staff member nor their family member is experiencing any of the symptoms of the virus infection.

School administrators said the staff member will self-quarantine as officials discuss the situation with the state Department of Public Health.

In Arlington, officials brought cleaning crews in to disinfect not only the Stratton School but Dallin Elementary School and Gibbs Middle and Arlington High schools. Brodie said crews will have all four buildings disinfected by the start of school Monday.

The Arlington and Worcester positive results are among 15 such cases announced by the state Sunday, health officials said. So far, Massachusetts has seen 28 cases of positive test results for new Coronavirus. All of the state tests are considered “presumptive positive” results until confirmed by the U.S. Centers for Disease Control and Prevention.