Doctors urge Ontario to open 4th doses of COVID-19 vaccine to all adults

Some doctors are calling on Ontario to allow all adults to get a second booster of a COVID-19 vaccine this summer, something that the province is currently limiting to only a portion of the population. Around 7.4 million Ontarians have received one booster, and nearly 90 per cent of those shots were administered at least five months ago, according to Public Health Ontario data. Studies have shown the COVID-19 boosters begin to lose some effectiveness four months after being administered, leading to growing calls for Ontario to widen eligibility for a second booster, equivalent to a fourth dose of vaccine.