It is my belief that Canada is now moving away from the Astra Zeneca vaccine for a variety of reasons. There have been production problems with this vaccine almost from the start, especially with the U.S. vaccine production facility in Baltimore, MD. There is also a very remote chance that this vaccine can cause some serious blood clots in some individuals. You may want to check with your ministry of health if you have already received the AZ vaccination. I believe they will now offer you one of the approved vaccines.