Efficacy of Violet-Blue (405 nm) LED Lamps for Disinfection of High-Environmental-Contact Surfaces in Healthcare Facilities: Leading to the Inactivation of Microorganisms and Reduction of MRSA Contamination.

In particular, a significant trend ( p < 0.05) was observed for the desk and the keyboards, with a mean number of colonies on day 1 of 5 (CI 0–10) and 13 (CI 2–23) CFU/plate (reduction to day 0 of 78.13% and 86.38%, respectively), which remained constant until day 7 with 3 (CI 0–6) and 9 (CI 1–17) CFU/plate (87.50% and 89.96%, respectively) ( Figure 3 ).

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In fact, looking at the graph in Figure 3 , we can see a decreasing trend that remains constant at the points where the daily energy dose was 61.6 and 55.1 J/cm 2 .

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