Ontario to resume AstraZeneca shots for COVID-19 as second dose

Ontario is resuming use of the Oxford-AstraZeneca vaccine against COVID-19 but only as a second dose, saying health risks posed by the shot are low. Dr. David Williams, the province's chief medical officer of health, said Friday that those who received the first dose of AstraZeneca between March 10 and March 19 would be first in line to receive their second dose.

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