Video capturing 150 skaters on crowded ice rink in London, Ont. prompts greater monitoring Southwestern Public Health (SWPH) also identified a positive case at two Tillsonburg schools Sunday, South Ridge Public School and Westfield Public School.These cases follow a pair of positive cases announced Saturday at Princess Anne French Immersion Public School in London and Huron Park Secondary School in Woodstock.Public health officials say contact tracing is underway and all of the schools remain open at this time.