A jar full of empty COVID-19 vaccine vials is shown at the Junction Chemist pharmacy during the COVID-19 pandemic in Toronto on April 6, 2022. Federal health officials are bracing Canadians for another round of COVID-19 vaccines expected to roll out in the fall, and are urging those behind on their boosters to catch up now. Canada's chief public health officer Theresa Tam says circulating Omicron subvariants BA.4 and BA.5 are even more transmissible and able to evade immunity than previous versions, making a rise in cases likely in coming weeks. THE CANADIAN PRESS/Nathan Denette