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A global shortage of respirators (e.g., N95 and N100) and surgical masks has led the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC) to recommend conservation and, when necessary, the reuse of respiratory personal protective equipment (PPE in response to the COVID-19 (SARS-CoV-2) surge. As a last resort, homemade masks should only be used when supplies of medical masks or respirators have been completely depleted.
