Competing Interests: Competing interests: We have read and understood BMJ policy on declaration of interests and have the following interests to declare: SES received funding from the Canadian Institutes of Health Research, Health Canada, and the Public Health Agency of Canada /covid-19 Immunity Task Force to conduct covid-19 research in long term care homes, and is an investigator in the SPOR Evidence Alliance. SES was a member of the Royal Society of Canada COVID-19 Task Force. SM received funding from the Canadian Institutes of Health Research to conduct COVID-19 research. SM and JW were volunteer members of the Ontario Modelling Consensus Table, under the umbrella of the Ontario Science Advisory Board.