Spreading a Durable Protective Layer of Quaternary Ammonium Agents on an N95 Respirator for Predecontamination of Airborne Mycobacterium tuberculosis and Viruses Using Mycobacterium smegmatis and Bacteriophage MS2 as Models

Table 2

Phase one testing of the colony/plaque reduction efficiency against deposited M. smegmatis, E. coli, and MS2 phage aerosols of 10⁵ CFU (or PFU)/m³.

Layer	M. smegmatis		E. coli		MS2 phage
	2 hours	7 days	2 hours	7 days	2 hours	7 days
1	93.9 (7.4)	90.2 (7)	94 (2.2)	93 (4.5)	99.9 (0)	99.7 (<0.01)
2	86.9 (4)	85.2 (10.7)	87.6 (4.4)	94.4 (5.4)	99.6 (<0.01)	99.8 (<0.01)
3	98.2 (4)	88 (9)	99.9 (0)	98 (3.4)	99.9 (0)	99.7 (<0.01)
4	90.5 (1.9)	88.4 (9.8)	94.4 (1.7)	89.5 (2.7)	99.9 (0)	99.9 (0)
Average	92.4 (4.8)	87.9 (2.06)	93.9 (2.9)	93.7 (3.5)	99.8 (<0.01)	99.8 (<0.01)

The sample size is 72. Values are provided as percentages (%). The numbers in parentheses represent standard deviations.