COVID-19 booster shots shouldn’t be Canada’s priority, experts say It advised that third doses wouldn’t be administered at pharmacies or the main vaccination clinic site in the northwestern Ontario city.“Further details on third doses will be provided shortly,” the health unit said in a Wednesday statement.Waterloo Region’s health unit said patients with hematological cancers receiving local care would be contacted within the next two weeks to plan the third shot around their treatment.It said third doses would be administered at regional clinics, doctors’ offices and participating pharmacies, adding officials would work directly with eligible congregate settings for on-site third-dose clinics.