Here’s what you need to know about 4th doses of COVID vaccine

(Brandi Weike/ CBC News) — If you’ve heard that Israel is well underway administering fourth doses of COVID-19 vaccine, you may be wondering if it will soon be time to hunt for another vaccine appointment yourself.

It’s long been the plan to offer immunocompromised Canadians a three-dose primary series of shots followed by a booster, but it’s not clear yet that a fourth round of vaccine is necessary for the broader population.

Israel’s situation is a little different, explains virologist Darryl Falzarano, a research scientist at the University of Saskatchewan in Saskatoon, who studies virus transmission as well as immune response to infection. (…)