Philadelphia businesses must now require masks or proof of vaccination from employees and customers, while large outdoor events with no seating will also need to implement masks as the city updates its coronavirus guidance.

In addition, all city employees will need to be vaccinated by Sept. 1 or wear two face masks, Acting Health Commissioner, Dr. Cheryl Bettigole announced Wednesday. The new guidelines, which take effect at midnight, come as COVID-19 infections rise again across the country, driven largely by the more transmissible delta variant and a struggle to get people vaccinated.

Businesses that require all staff and customers be fully vaccinated will not be subject to the masking rule, Bettigole said.