Figure 5. The variation of bacteria concentration on the lift button (red circle) and the handrail (blue square) before far-UVC irradiation during sampling tests from Mar. 25 to Jul. 29, 2021

From

Systematical Investigations on Disinfection Effectiveness of Far-UVC (222 nm) irradiation: From Laboratory Study to Field Tests

Ruijie Xie, Gabriel Y. K. Tse, Linda C.L. Man, Anthony L.H. Cheung, Dickson T. C. Wong, Edmond H. M. Lam, Haibao Huang, Dennis Y.C. Leung

Journal of Applied & Environmental Microbiology. 2022, 10(1), 17-34 doi:10.12691/jaem-10-1-3