COVID-19: Ontario pharmacies waiting on AstraZeneca vaccine shipments A spokeswoman for the health minister said the quality checks were needed because storage data for some of the doses was incomplete.“No dose will be sent that isn’t deemed to be safe,” said Alexandra Hilkene.Ontario stopped giving out first doses of the AstraZeneca vaccine earlier this month after saying it was linked to an increased risk of a rare but serious blood clotting disorder.The province started offering second shots of the vaccine this week — at a 10-week dosing interval — to the first batch of AstraZeneca recipients in order to use up the doses that expire soon.Ontarians who received the vaccine between March 10 and March 19 in Kingston, Windsor and Toronto.