OTTAWA—Canada’s procurement minister says she is in the midst of negotiating new vaccine contracts to nail down supplies of vaccine booster shots if they’re needed next year. “We are actively planning for 2022,” Anita Anand said in a recent interview with The Canadian Press. She said Canada’s first priority remains getting doses now, and while the country remains well behind the United States, United Kingdom and several other countries, its vaccination pace has picked up significantly in the last month. Canada expects to get every adult vaccinated fully—with both doses of the Pfizer-BioNTech, Moderna or Oxford-AstraZeneca vaccines or one shot of the single-dose Johnson & Johnson—by the end of September at the latest. Teenagers likely will be vaccinated by then as well, but vaccines for kids under 12 aren’t expected to be authorized until at least the fall. Still, many experts believe additional booster shots are going to be necessary, …