Thames Valley District School Board is reporting an additional five school-related cases of COVID-19 at four of its schools.The cases were reported Monday evening and Tuesday morning and include: Positive COVID-19 cases identified at 4 schools in Middlesex-London All four schools remain open, with school buses operating as usual.[ Sign up for our Health IQ newsletter for the latest coronavirus updates ]Southwestern Public Health is investigating the cases at Elgin Court, Parkside Collegiate Institute and East Elgin, while the Middlesex-London Health Unit is looking into the case tied to Westminster.The board says both public health units are in the process of identifying close contacts “and following up directly to provide specific.