Use and perceptions of antibiotics among US adults aged 50–80 years

Abstract

The analytical model includes simplifying assumptions such as negligible effects of multiphase flow and leakage around the surgical mask edges. In addition, the seal’s balance ratio might increase during inhalation, thereby creating a countering increase in seal competence. Covering N95 FFRs with a surgical mask can potentially increase the occurrence of N95 FFR leakage. Appropriate assessment of this risk will require additional research, including higher-order theoretical analysis, computational fluid dynamics modeling, bench tests, and/or human studies. As we engage in that work, we encourage others to do the same. Pending further study, N95 FFR clinical guidance and instructions to cover N95 FFRs with surgical masks should consider and assess this risk.