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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Curr Opin Pharmacol. 2013 Sep 20;13(5):10.1016/j.coph.2013.08.009. doi: 10.1016/j.coph.2013.08.009

Table 1.

Studies of UVC irradiation for inactivation of bacteria/fungi in vitro

Light Source Radiant Exposure Bacterial/Fungi species/strains Inactivation efficacy Reference
254nm UVC 15.54 mW/cm2 MRSA, VRE antibiotic-susceptible strains of S. aureus and E. faecalis Illuminated 5 seconds, 99.9% MRSA and VRE inactivation; illuminated 9 seconds, 100% MRSA inactivation; illuminated 45 seconds, 100% VRE inactivation 5
254nm UVC 5mW/cm2 MRSA, Streptococcus pyogenes Illuminated 5 seconds, methicillin-resistant, coagulase-negative Staphylococcus and Streptococcus pyogenes inactivation; Illuminated 15 seconds, methicillin-susceptible S. aureus and Enterococci species inactivation 6
265nm UVC 1.93 mJ/cm2 S. aureus, E. coli, Pseudomonas aeruginosa, S. pyogenes Illuminated 1 seconds, 100% inhibition for all strains 7
254nm UVC 1500mJ/cm2 catheter biofilms of E. coli, coagulase-negative Staphylococcus, E. faecalis, Streptococcus, P. aeruginosa, Coryneforms Mean killing rates of the bacteria in catheter biofilms were 89.6% (11.8 mJ/cm2), 98% (47 mJ/cm2) and 99% (1500 mJ/cm2) 8
254nm UVC 120mJ/cm2 Trichophyton rubrum, T. mentagrophytes, Epidermophyton floccosum, Microsporum canis. 3–5 log10 of fungal inactivation 9
UVC 15.54 mW/cm2 bacteria (P. aeruginosa and Mycobacterium abscessus) and fungi (Candida albicans, Aspergillus fumigatus) Illuminated 3–5 seconds, 99% bacteria inactivation; Illuminated 15–30 seconds, 99% fungi inactivation 10