Who should get a fourth COVID-19 vaccine dose — and when? - Toronto Star

New Omicron variants, combined with waning immunity for many Canadians, lead to a tricky debate, as Health Canada looks out for “concerning trends.”

As the protection given by a third dose of COVID-19 vaccine begins to wane for many Canadians, the question is quickly rising of whether eligibility for a fourth shot should be expanded — and if so, … [+6153 chars]

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