Pub manager Crystal Meikle is used to pivoting with the shifting rules for businesses during the COVID-19 pandemic.

But Ontario’s proof-of-vaccination policy, set to take effect on Wednesday, treads into new territory, she said, since workers will be tasked with asking customers to show they are immunized against the virus.

“The pushback is where I get a little nervous,” Meikle said on a recent afternoon shift at the Queen’s Head pub in east Toronto. “It’s the unknown of how somebody is going to react.”

Last week, the province outlined its guidelines for businesses required to make the checks. Patrons at dine-in