COVID-19 exposure at her school was within her cohort, and she later tested positive herself.The principal at Sentinel Secondary notified staff and parents on Saturday that someone in the school had tested positive for the coronavirus, according to Renée Willock, president of the West Vancouver Teachers’ Association.Later that day, a number of students in the same cohort as the test-positive case were told to self-isolate, Willock said.But the teacher didn’t find out until those same students contacted her to ask about remote-learning options, she said.On Sunday, the teacher wasn’t feeling well and went to get tested.