Table 1. Efficiency of test mask configurations for filtration of influenza A virus and rhinovirus 14.

Test mask configuration*	Influenza A (H1N1) virus (Strain A/PR/8/34)			Rhinovirus Type 14 (Strain 1059)
	% Filtration by infectivity†	% Filtration by RT-PCR†		% Filtration by infectivity†	% Filtration by RT-PCR†
1	99.7%±0.5%	100%±0.0%		99.6%±0.5%	97.0%±5.2%
2	99.9%±0.1%	99.3%±1.0%		99.8%±0.2%	99.5%±0.9%
3	99.6%±0.5%	98.9%±1.8%		99.9%±0.2%	99.6%±0.5%

This work was performed by Microbac Laboratories (Sterling, USA). *Configurations: 1, test mask with Smart Valve and without Micro Ventilator; 2, test mask with covered/sealed Smart Valve and without Micro Ventilator; 3, test mask with Smart Valve and operating Micro Ventilator. †, mean ± standard deviation (N=3).