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 1

Phase one testing of the colony/plaque reduction efficiency against deposited M. smegmatis, E. coli, and MS2 phage aerosols of 10⁴ CFU (or PFU)/m³.

Layer	M. smegmatis		E. coli		MS2 phage
	2 hours	7 days	2 hours	7 days	2 hours	7 days
1	99.6 (0.5)	96 (3.4)	99.9 (0.05)	99.9 (0)	99.0 (0)	99.0 (0)
2	95.3 (8)	87.5 (12)	99.9 (0.05)	94.4 (5.4)	95.2 (0.03)	99.0 (0)
3	99.9 (0)	99.9 (0)	99.9 (0)	99.9 (0)	97.5 (0.03)	99.0 (0)
4	96 (6.9)	91.9 (5.8)	96.6 (5.74)	89.5 (2.7)	97.5 (0.03)	99.0 (0)
Average	97.7 (2.4)	93.9 (5.3)	99.1 (1.6)	95.9 (5.0)	97.3 (0.03)	99 (0)

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