0.5 log-load reduction is a 66% decrease. A 1.5 reduction is 96%, which is N95 standard. Starting from 2.56, a log reduction of 3-4 is impossible. In any case,

0.5 log-load reduction is a 66% decrease. A 1.5 reduction is 96%, which is N95 standard. Starting from 2.56, a log reduction of 3-4 is impossible. In any case, the large number of NDs (not detected) everywhere in the table, but especially inside the masks after the patient just coughed in them (which the authors struggle to explain), makes this entire experiment very suspect. (Just look at the reported results for patient 4, which make no sense at all!)