“For optimal protection against respiratory pathogens such as #SARS-CoV-2, procedure #masks shouldn't be worn over #N95 filtering facepiece respirators (#FFRs), according to a study published today in Infection Control & Hospital #Epidemiology.”

“The additional resistance created by an overlying face mask can lead to increased airway pressures that cause leakage at the N95 FFR facial seal…”

https://www.cidrap.umn.edu/covid-19/study-wearing-surgical-masks-over-n95s-can-cause-dangerous-leaks

#COVID #IPC #IPAC #MaskUp #BetterMasks