The widespread use of face masks by the public could put NHS supplies at risk, says Chris Hopson, chief executive of NHS Providers.
In hospitals, different types of masks offer different grades of protection. The most protective is an FFP3 or, alternatively, an N95 or an FFP2.
NHS staff in lower-risk situations can wear a surgical mask. This includes healthcare workers within one meter of a patient with possible or confirmed Covid-19. These staff may be in hospitals, primary care, ambulance trusts, community care settings and care homes.