Union leaders raise safety concerns over Nova Scotia’s back-to-school planChurchill and Dr. Robert Strang, the province’s chief medical officer of health, provided details Wednesday on how public health will respond when cases of COVID-19 are identified in schools.Students, teachers or others who have had some or prolonged contact with someone who tests positive for COVID-19 will be sent home to isolate for two weeks and will be tested.Those who had casual contact with a confirmed case, either by walking past them or being near them in a hallway or in other common areas, will not be required to isolate.Asked about parent and union concerns over the lack of social distancing in many classrooms, Strang said there are other health measures in.