TORONTO : Canada is "aggressively negotiating" with drugmakers on delivery schedules for potential COVID-19 vaccines and shipments would begin early in 2021 under existing deals, Canada's minister of public services and procurement told Reuters on Thursday.The Canadian government has announced four vaccine purchase deals and is negotiating more, while also funding local projects that are less advanced, and building new vaccine manufacturing capacity at a facility in Montreal.The exact timing of deliveries depends on the result of clinical trials, regulatory approvals and manufacturing capacity, the minister, Anita Anand, said.