To the Editor: The study by Dr Loeb and colleagues1 concluded, “Among nurses in Ontario tertiary care hospitals, use of a surgical mask compared with an N95 respirator resulted in noninferior rates of laboratory-confirmed influenza.” However, the study methods did not describe the filtering efficiency of the surgical masks that were used in this study.
Bitar R. Surgical Masks vs N95 Respirators for Preventing Influenza. JAMA. 2010;303(10):937–939. doi:10.1001/jama.2010.193
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