He said the rate of uptake for fourth doses by Ontarians aged 70 and older — around 16 per cent — was “not acceptable” and said public health measures like mandatory masking could return “if necessary.”

“Sixteen per cent is absolutely not acceptable to me,” he said, urging people to book an appointment.

“It may be that every winter that we’ll need an annual booster to protect us through those dark days of winter, where we’re indoors more often,” he said.

https://globalnews.ca/news/9196496/ontario-covid-19-kieran-moore-booster-masks/