Nurses, researchers and workplace safety officers worry new guidelines from the Centers for Disease Control and Prevention might reduce protection against the coronavirus and other airborne pathogens in hospitals.

A CDC advisory committee has been updating its 2007 standards for infection control in hospitals this year. Many health care professionals and scientists expressed outrage after the group released a draft of its proposals in June.

The draft controversially concluded that N95 face masks are equivalent to looser, surgical face masks in certain settings — and that doctors and nurses need to wear only surgical masks when treating patients infected by “common, endemic” viruses, like those that cause the seasonal flu.