UNITED STATES (WSYR-TV) — The largest union of registered nurses in the country is once again raising concerns about mask wearing.  

National Nurses United just sent a letter to the Centers for Disease Control and Prevention, urging the agency to update its guidance.  

The union is asking the CDC to reinstate the recommendation for everyone to wear masks in public, or when they’re close to people outside their household. The rising cases is the reason behind their concern.