Open this photo in gallery People at the Telus World of Science during the first of four days of free admission for essential workers and their families in Vancouver on July 23, 2020.... Those provinces say they have no plans to tighten indoor mask mandates, despite the urging of health experts who say mask wearing will help curb the spread of the Delta variant.... The spread of Delta forced Israel to reimplement a mask mandate in late June, just 10 days after lifting it, when daily cases rose