Vaccination is a key strategy to protect against coronavirus disease 2019 (COVID-19). In December 2020, Ontario started its COVID-19 vaccination rollout, beginning with the Pfizer-BioNTech COVID-19 vaccine. A phased approach was implemented to prioritize individuals at the greatest risk of severe disease.1 This approach was also used for booster doses. Hospital clinics and mass immunization clinics were some of the earlier settings for vaccine administration. As the vaccination rollout evolved, more COVID-19 vaccines and administration channels became available.
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