The idea of waning immunity has picked up steam in recent weeks, with some countries using it to justify rolling out third-dose COVID-19 vaccine boosters to their populations. But immunologists say the concept has been largely misunderstood.
The federal election campaign entered its final hours on Sunday with party leaders making last-minute appeals in whirlwind tours of swing ridings, all while still trying to convince voters to buy into their version of what this vote is all about.
Conservative Leader Erin O'Toole delivered his starkest plea yet for people not to split the vote on the right by picking the People's Party of Canada Sunday, on what was his last day before polls open.
Liberal Leader Justin Trudeau on Sunday pitched his party as the only one that can stop Erin O'Toole's Conservatives from forming government as he crossed the country in a flat-out sprint for last-minute votes.