Background: Effective environmental surface cleaning plays a vital role in reducing transmission of hospital-acquired infections. There remains a paucity of data in the pediatric literature regarding environmental pathogen reduction utilizing UV-C light. The objective of this study was to evaluate the reduction of environmental pathogens using UV-C light (Clorox Optimum-UV) as an adjunct to terminal cleaning in a free-standing tertiary pediatric hospital.
Methods: Upon patient discharge, a subset of patient rooms were tested for pathogens.
Surface swabs were collected from high touch surfaces (call button, telemetry
monitor, door handle, flush handle of toilet, faucet, bed rail, phone, keyboard
pad, mouse, side table, dresser, and light switch). After terminal cleaning
of the room, per hospital protocol the Clorox Optimum-UV completed one or two
cycles of 5 minutes each depending on the dimensions of the room. Post-UV-C
surface swabs were obtained from the same high touch areas in the room. Total
colony count was reported from each of the surfaces swabbed. Swabs were streaked
onto non-selective agar and incubated at 30-35oCdegrees for 72-96
hours. Mean plate colony count was determined manually and reported as
Data analysis was performed in Minitab 18.1. Fisher Least Significant Difference (LSD) test was used to describe the difference between total bacterial counts at each time point (Pre-clean: dirty room, Post-clean: pre-UV-C/post terminal clean, Post-UV: post UV-C light cycle).
Results: Mean total colony counts prior to cleaning the room was 92.3 CFU (33 surfaces), Pre-UV-C light 45.6 CFU and post-UV-C light 5.8 CFU (64 surfaces). Total bacterial counts are represented in Graphs 1 and 2. Upon multivariate analysis, the time the sample was taken (pre-clean, post-clean or post-UV) was the single explanatory variable for the differences seen in the means of total bacterial counts (p-value = 0).
Conclusion: Our study demonstrates that UV-C disinfection is a highly effective adjunctive cleaning method with standard terminal cleaning to reduce bacterial burden from environmental surfaces.
1: Total Bacterial Counts (CFU) at each timepoint of surface sampling
Graph 2: Total Bacterial Counts (CFU) with 95% Confidence Intervals at each timepoint of surface sampling
M. Nayakwadi Singer, Clorox: Grant Investigator , Grant recipient .
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