The COVID-19 pandemic has led to challenges in the steady supply of single-use masks (respirators) [1] and many hospitals are faced with using new types of respirators to avoid stock-outs. While certified FFP2/KN95 respirators have the ability to prevent airborne infections, like COVID-19, influenza or tuberculosis, the performance of the respirators depends on tight sealing of nose and mouth.



Ashashyou [CC0], from Wikimedia Commons

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Citation: Lukas KleinjohannChristoph Lange