St Osmund’s Middle School (top left), Westfield Arts College (top right), Damer’s First School (bottom left) and St Mary's CE VC First School (bottom right) have all confirmed cases of coronavirus. Picture: Google FOUR Dorset schools have confirmed cases of coronavirus, with students and staff self-isolating as a result. Despite schools being closed to most pupils, they must remain open for children of key workers and vulnerable pupils. St Osmund’s Middle School, based on Barnes Way in Dorchester, and Damer’s First School on Liscombe Street in Poundbury, both reported single cases of coronavirus on Tuesday, January 26.