Cohorting practices as they currently stand are "insufficient" and put itinerant teachers especially at risk, said public health experts and four Ontario teacher unions at a Wednesday press conference.
Cohorting in its current state is currently failing, said Amy Greer, a tier-two Canada research chair in population disease and an associate professor in epidemiology.
If there is any crossover between students in different cohorts, Greer said the cohorts end up being one very large cohort rather than the smaller, isolated groups they are intended to be. Students may be in one cohort with their class during the day, for instance, but are exposed to a different cohort when they take the bus home, she explained.