Ontario says the Oxford-AstraZeneca vaccine will be offered to people 40 and over beginning Tuesday at hundreds of drugstores already stocked with the serum. The office of the Health Minister, Christine Elliott, confirmed the change on Sunday. The federal committee that first stalled on approving AstraZeneca, then approved it for over 55s, has now approved it for adults over 18. But supplies will limit such use to those over 40 in the coming days. Medical advice to the public throughout the western world has been universal to take the first vaccine available, including AstraZeneca.