With the new delta variant, New York City Mayor Bill de Blasio says that a voluntary system for COVID-19 vaccinations has reached its limit. He is set to announce a vaccination-or-test mandate to all NYC workers. The over 300,000 workers will be expected to either show proof of vaccination or submit to weekly testing in two phases. Employees at publicly run residential or congregate care facilities will have a deadline of August 16th and all other city employees will have until September 13th. The Mayor will also encourage private employers to establish vaccination policies before returning to offices.
See "NYC Mayor to mandate vaccination or weekly testing of city workers", Nolan Hicks, New York Post, July 26, 2021