Second doses of COVID vaccine

Sign that says "Book your second COVID-19 vaccine dose" at the Invista Centre in Kingston, Ontario on Monday, March 1, 2021, as the COVID-19 pandemic continues across Canada and around the world. THE CANADIAN PRESS IMAGES/Lars Hagberg

How soon are second doses coming for Canadians, and who will get them first?

Vaxx Populi: The four-month interval between doses is ticking away for Canadians, while new research is emerging about the optimal time to wait