Disposable isolation masks, NIOSH-certified N95 respirators, and FDA/CE-certified KN95 respirators.
Note: The CDC, FDA, and CE have recognized KN95 respirators as suitable replacements for the N95 during the COVID-19 health crisis.
Strategies for Optimizing the Supply of N95 Respirators
CDC - Centers for Disease Control and Prevention
FAQs on Shortages of Surgical Masks and Gowns
FDA - US Food and Drug Administration