CALGARY -- New data has led to new advice about AstraZeneca’s vaccines being safe for Canadian seniors, but it is not expected to make a significant difference to Alberta’s vaccine rollout. Since the AstraZeneca vaccine's initial approval for use in this country last month, Canada's National Advisory Committee on Immunizations (NACI) said it used three real-world studies to justify expanding its advice to include those 65 and older. But at a news conference this week, Alberta’s top doctor suggested that it wouldn’t change vaccination plans much. “We'll be looking at who would be able to receive vaccine or who wouldn't already have had it offered to them and take that into account,” said Dr. Deena Hinshaw on Monday.