What a 4th COVID shot can do for you — and what it can't - CBC News

Fourth doses of COVID-19 vaccines are rolling out to more Canadians as eligibility opens up across the country, but research suggests there are limitations to the impact they can have on the highly contagious BA.5 Omicron subvariant fuelling Canada's first su…

This is an excerpt from Second Opinion, a weekly analysis of health and medical science news. If you haven't subscribed yet, you can do that by clicking here. Fourth doses of COVID-19 vaccines are r… [+9709 chars]

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