Winnipeg Free Press Pharmacist Ryan Chan administers an Oxford-AstraZeneca vaccine dose at the Exchange District Pharmacy in Winnipeg. MANITOBA pharmacies and clinics that administer AstraZeneca COVID-19 vaccines have to take matters into their own hands to make sure no doses spoil. MANITOBA pharmacies and clinics that administer AstraZeneca COVID-19 vaccines have to take matters into their own hands to make sure no doses spoil. "It’s a logistical nightmare to prevent (wastage)," said Ryan Chan, owner of Exchange District Pharmacy on McDermott Avenue. The pharmacist prevented precious doses from going down the drain by developing a list of standby patients the day before the province sent its vaccine allotment.