Questions linger on use of remaining AstraZeneca vaccine; Alberta records almost 1,800 new cases Hinshaw announced on Tuesday the province would be halting the use of AstraZeneca for first doses because of 'global supply challenges' Author of the article: Alanna Smith Publishing date: May 12, 2021 • 58 minutes ago • 3 minute read • David Bertram was photographed near his southwest Calgary home on Saturday, May 8, 2021. Bertram is hoping he can get his second dose of AstraZeneca vaccine before cancer treatments this summer will make him unable to take the vaccine. Photo by Gavin Young/Postmedia Article content A 63-year-old Calgarian says he’s watching the Government of Alberta website “like a hawk” so he can book his second dose of AstraZeneca as soon as possible, considering the province’s limited supply.