Mayor Bill de Blasio expanded New York City's vaccine mandate to include all city workers on Monday. Starting this fall, employees who have not provided proof of COVID-19 vaccination must test weekly for the virus. Unvaccinated workers will have until Sept. 13 to complete their vaccine series or opt for a virus test each week. But before that deadline kicks in, the mayor said unvaccinated workers must wear a mask at work starting Aug. 2. The new vaccine mandate begins with city employees who work in congregate settings. That group, roughly 45,000 workers, will have to start testing weekly if they have not received their dose of the vaccine by Aug. 16. "This is about our recovery. This is about keeping people safe, making sure our families get through COVID okay," de Blasio said. "September is the pivot point of the recovery, September is when many employers are bringing back a lot of their employees. It's when schools start full-strength, it's when people come back from summer."