Guidance on an additional COVID-19 booster dose in the spring of 2023 for individuals at high risk of severe illness due to COVID-19Published: March 3, 2023 Post author By Public Health Agency of Canada Post date 26 March 2023 ← Recommendations: High-risk Spring 2023 COVID-19 Vaccine Booster Dose Program in Ontario → Tell Me More Series: Herd Immunity
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