TABLE 1.

Efficacy of Zoono Z71 when applied to stainless steel or polystyrene surfaces and inoculated with ɸ6^a

Days after application of antimicrobial coating	Stainless steel		Polystyrene
	Contact time
	60 min	120 min	60 min	120 min
1	≥6.9	≥6.9	≥7.0	≥6.9
7	≥6.9	≥6.8	≥6.7	≥6.9
14	≥6.9	≥6.9	≥6.8	≥6.9
21	≥6.8	≥6.6	≥6.9	≥6.6
28	≥7.0	≥6.7	≥7.0	≥7.1

^aEfficacy is expressed as the mean log₁₀ reduction (n = 1 experimental trial with three coupons per condition), calculated by subtracting the mean ɸ6 PFU recovered from coated coupons from the mean ɸ6 PFU recovered from noncoated coupons at each contact time. Undetected virus observations were assumed to have a concentration of 20 PFU/coupon, which is the theoretical limit of detection, for the analysis.