As more evidence emerges on the efficacy of third doses of the COVID-19 vaccine, experts say it’s high time public health authorities revise the definition of “fully vaccinated” to include a booster dose.
While most SARS-CoV-2 vaccines available in Canada were initially developed and tested to include two doses – with the exception of the Johnson & Johnson vaccine – a primary course should instead consist of three doses, said Colin Furness, an expert in infectious disease epidemiology from the University of Toronto.
