New Ontario study finds even one COVID-19 vaccine dose provides strong protection against variants

Young people line up for COVID-19 vaccines at Downsview Arena in Toronto on Monday, May 10, 2021. Ontario has just opened up vaccines for 18+ in high risk areas. THE CANADIAN PRESS/Frank Gunn Young people line up for COVID-19 vaccines at Downsview Arena in Toronto on Monday, May 10, 2021. Ontario has just opened up vaccines for 18+ in high risk areas. THE CANADIAN PRESS/Frank Gunn

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