The Occupational Safety and Health Administration has updated its guidance for protecting unvaccinated and other at-risk workers from the coronavirus.

OSHA now recommends that even fully vaccinated workers wear masks in high concentration areas, to protect unvaccinated colleagues. In addition, fully vaccinated workers who have close contact with people who have coronavirus should wear masks for up to 14 days unless they have a negative coronavirus test at least three to five days after such contact, OSHA said.

Prior guidance said that those who have been vaccinated could resume activities without wearing a mask or staying six feet apart, except where required by federal, state, local, tribal or territorial laws, rules and regulations, including local business and workplace guidance. 

“OSHA continues to emphasize that vaccination is the optimal step to protect workers and encourages employers to engage with workers and their representatives to implement multi-layered approaches to protect unvaccinated or otherwise at-risk workers from the coronavirus,” the agency stated in a press release

The most recent guidance is based on developments in science and data, including the Centers for Disease Control and Prevention’s updated COVID-19 guidance issued July 27. OSHA said it will continue to review the COVID-19 Healthcare Emergency Temporary Standard every 30 days.