EXPLAINER: What you need to know about fourth dose COVID vaccines

EXPLAINER: What you need to know about fourth dose COVID vaccines

With Ontario in the grips of a new COVID wave, this time driven by the new, ultra-contagious BA.5 variant, the province has announced that everyone 18 and older in Ontario is eligible for a second booster, or fourth dose, of a COVID-19 vaccine, starting Thursday.

EXPLAINER: What you need to know about fourth dose COVID vaccines
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