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

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 summer surge.

from CBC | Health News https://ift.tt/94CJQOi