SAN FRANCISCO (KRON) – In an interview with CNBC, Danny Meyer, founder of the popular burger joint Shake Shack, said all employees and customers who enter his Union Square Hospitality Group restaurants will be required to be vaccinated against the coronavirus.

Business around the country are starting to announce vaccination requirements as Delta variant concerns mount.

While the restaurant group includes high end restaurants in New York and Washington D.C., Meyer noted that the more accessible Shake Shack brand had still yet to decided if a similar requirement would be put in place.