Public Health Sudbury and Districts, once again, is notifying the Rainbow District School Board that students on two local bus routes must self-isolate due to possible exposure to COVID-19. Some students from Alexander Public School on the afternoon elementary bus route L811 and some students from Princess Anne Public School on the morning elementary bus route L653 must self-isolate up to and including Oct. 23. Both bus routes have been cancelled for the remainder of the week and will resume on Tuesday, following the PA day.