scholarly journals Impact of Room Location on UV-C Irradiance and UV-C Dosage and Antimicrobial Effect Delivered by a Mobile UV-C Light Device

2016 ◽  
Vol 37 (6) ◽  
pp. 667-672 ◽  
Author(s):  
John M. Boyce ◽  
Patricia A. Farrel ◽  
Dana Towle ◽  
Renee Fekieta ◽  
Michael Aniskiewicz
Keyword(s):  
Staphylococcus Aureus ◽  
Stainless Steel ◽  
Prospective Observational Study ◽  
Uv Light ◽  
Antimicrobial Effect ◽  
M 10 ◽  
Surgical Ward ◽  
Ultraviolet C ◽  
Vancomycin Resistant ◽  
Uv C

OBJECTIVETo evaluate ultraviolet C (UV-C) irradiance, UV-C dosage, and antimicrobial effect achieved by a mobile continuous UV-C device.DESIGNProspective observational study.METHODSWe used 6 UV light sensors to determine UV-C irradiance (W/cm2) and UV-C dosage (µWsec/cm2) at various distances from and orientations relative to the UV-C device during 5-minute and 15-minute cycles in an ICU room and a surgical ward room. In both rooms, stainless-steel disks inoculated with methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus (VRE), and Clostridium difficile spores were placed next to sensors, and UV-C dosages and log10 reductions of target organisms achieved during 5-minute and 15-minute cycles were determined. Mean irradiance and dosage readings were compared using ANOVA.RESULTSMean UV-C irradiance was nearly 1.0E-03 W/cm2 in direct sight at a distance of 1.3 m (4 ft) from the device but was 1.12E-05 W/cm2 on a horizontal surface in a shaded area 3.3 m (10 ft) from the device (P<.001). Mean UV-C dosages received by UV-C sensors located at different distances and orientation relative to the device varied significantly during 5-minute cycles and during 15-minute cycles (P<.001). Log10 reductions ranged from >4 to 1–3 for MRSA, >4 to 1–2 for VRE and >4 to 0 log10 for C. difficile spores, depending on the distance from, and orientation relative to, the device with 5-minute and 15-minute cycles.CONCLUSIONUV-C irradiance, dosage, and antimicrobial effect received from a mobile UV-C device varied substantially based on location in a room relative to the UV-C device.Infect Control Hosp Epidemiol 2016;37:667–672

scholarly journals Rapid Hospital Room Decontamination Using Ultraviolet (UV) Light with a Nanostructured UV-Reflective Wall Coating

2013 ◽  
Vol 34 (5) ◽  
pp. 527-529 ◽  
Author(s):  
William A. Rutala ◽  
Maria F. Gergen ◽  
Brian M. Tande ◽  
David J. Weber
Keyword(s):  
Staphylococcus Aureus ◽  
Clostridium Difficile ◽  
Uv Light ◽  
Methicillin Resistant ◽  
Hospital Room ◽  
Ultraviolet C ◽  
Uv C

We tested the ability of an ultraviolet C (UV-C)–reflective wall coating to reduce the time necessary to decontaminate a room using a UV-C-emitting device (Tru-D SmartUVC). The reflective wall coating provided the following time reductions for decontamination: for methicillin-resistant Staphylococcus aureus, from 25 minutes 13 seconds to 5 minutes 3 seconds (P < .05), and for Clostridium difficile spores, from 43 minutes 42 seconds to minutes 24 seconds (P < .05).

scholarly journals Decontamination of Targeted Pathogens from Patient Rooms Using an Automated Ultraviolet-C-Emitting Device

2013 ◽  
Vol 34 (5) ◽  
pp. 466-471 ◽  
Author(s):  
Deverick J. Anderson ◽  
Maria F. Gergen ◽  
Emily Smathers ◽  
Daniel J. Sexton ◽  
Luke F. Chen ◽  
...  
Keyword(s):  
Tertiary Care ◽  
Environmental Services ◽  
Convenience Sample ◽  
Vancomycin Resistant Enterococci ◽  
Colony Forming Units ◽  
Before And After ◽  
Ultraviolet C ◽  
Vancomycin Resistant ◽  
Tertiary Care Hospitals ◽  
Uv C

Objective.To determine the effectiveness of an automated ultraviolet-C (UV-C) emitter against vancomycin-resistant enterococci (VRE),Clostridium difficile, andAcinetobacterspp. in patient rooms.Design.Prospective cohort study.Setting.Two tertiary care hospitals.Participants.Convenience sample of 39 patient rooms from which a patient infected or colonized with 1 of the 3 targeted pathogens had been discharged.Intervention.Environmental sites were cultured before and after use of an automated UV-C-emitting device in targeted rooms but before standard terminal room disinfection by environmental services.Results.In total, 142 samples were obtained from 27 rooms of patients who were colonized or infected with VRE, 77 samples were obtained from 10 rooms of patients withC. difficileinfection, and 10 samples were obtained from 2 rooms of patients with infections due toAcinetobacter. Use of an automated UV-C-emitting device led to a significant decrease in the total number of colony-forming units (CFUs) of any type of organism (1.07 log10reduction;P< .0001), CFUs of target pathogens (1.35 log10reduction;P< .0001), VRE CFUs (1.68 log10reduction;P< .0001), and C.difficileCFUs (1.16 log10reduction;P< .0001). CFUs ofAcinetobacteralso decreased (1.71 log10reduction), but the trend was not statistically significantP= .25). CFUs were reduced at all 9 of the environmental sites tested. Reductions similarly occurred in direct and indirect line of sight.Conclusions.Our data confirm that automated UV-C-emitting devices can decrease the bioburden of important pathogens in real-world settings such as hospital rooms.

scholarly journals Methicillin and Vancomycin Resistant Staphylococcus aureus and Associated Factors from Surgical Ward Inpatients at Debre Markos Referral Hospital, Northwest Ethiopia

2020 ◽  
Author(s):  
Samrawit Tefera Demsie ◽  
Tewachew Awoke ◽  
Daniel Mekonnen
Keyword(s):  
Staphylococcus Aureus ◽  
Associated Factors ◽  
Northwest Ethiopia ◽  
Referral Hospital ◽  
Mannitol Salt Agar ◽  
Surgical Ward ◽  
Hospital Infection Control ◽  
Multiple Variables ◽  
Vancomycin Resistant ◽  
Debre Markos

Abstract Background: Staphylococcus aureus is one of the leading wound infections. It is considered as a super bug. The epidemiology of Methicillin Resistant S. aureus (MRSA) and Vancomycin Resistant S. aureus (VRSA) is not well studied in Ethiopia particularly in Debre Markos Referral Hospital (DMRH). The objective of the study was to determine the prevalence of MRSA and VRSA and associated factors from wound cases admitted to surgical ward in DMRH, Northwest Ethiopia.Methods: A cross-sectional study was conducted from February-April 2020 at DMRH. A structured questionnaire was used to collect demographic and clinical characteristics. Wound swabs were collected using sterile cotton swab followed by culturing on Blood agar and Mannitol Salt agar. Then isolates were characterized by gram stain and biochemical tests. The presence of MRSA and VRSA was determined using the cefoxitin (30μg) antibiotic disc diffusion and vancomycin E-test, respectively. The data was analyzed using Statistical Package for Social Sciences, version 20 software. P-value <0.05 was considered statistically significant.Results: A total of 242 wound cases were enrolled and a majority of them were males (172, 71.1%). Among the total wound cases, the isolation rate of S. aureus was 29.3%. The proportion of MRSA was 13.22% and that of VRSA was 4.1%. The proportion of vancomycin intermediate S. aureus (VISA) was gauged at 4.5%. Hospital stay >72h (p=0.014), wound depth (p=0.043), antibiotic use (p=0.017) and previous history of wound infection (p=0.001) showed statistical significant association with MRSA. No variables showed significant association with VRSA.Conclusion: High proportions of S. aureus isolates are resistant to methicillin and vancomycin. Moreover, multiple variables demonstrated associations with drug resistance. Hence, hospital infection control and antibiotic stewardship program shall be strengthened.

scholarly journals Cost-Effective Disinfection Robot Using UVC Radiation

2021 ◽  
Vol 40 ◽  
pp. 02003
Author(s):  
Mansi Dhikle ◽  
Vinaya Dharne ◽  
Pankaja Gaikar ◽  
Kausar Fakir
Keyword(s):  
Video Streaming ◽  
Uv Light ◽  
Low Cost ◽  
Cost Effective ◽  
Live Video ◽  
Medical Facilities ◽  
Ultraviolet C ◽  
Cleaning Robots ◽  
Uv C ◽  
Uvc Radiation

Sanitization with human efforts is not an easy task. Chances of contracting infections increases which leads to additional spread of bacteria. Currently, normal cleaning robots are used in most of the places but looking at the current situation the sanitization techniques need to be improved. The robot uses radiation of UV rays to kill the microrganisms. It gives a live video streaming of its surrounding using a Wi-fi based camera. With the help of Bluetooth module and android mobile, we can control the movement of the robot inside the room without being physically present. It is built with PIC Microcontroller and Ultraviolet-C (UVC) Sanitization LED. UV-C has bandwidth range of 200-280nm and is most powerful when it comes to killing pathogens in the room. This allows us to sterilise the room effectively. By killing the germs, the UV light restricts their multiplication by destroying their reproductive system. Thus use of this robot lowers the threat of infection, cost of traditional cleaning and sterilisation and increases security in medical facilities. Thus, we are trying to implement a more efficient way of sanitization by building a Low cost UV sanitization Robot which can be used in small clinics and for household purpose.

Relative Resistance of the Emerging Fungal Pathogen Candida auris and Other Candida Species to Killing by Ultraviolet Light

2017 ◽  
Vol 39 (1) ◽  
pp. 94-96 ◽  
Author(s):  
Jennifer L. Cadnum ◽  
Aaron A. Shaikh ◽  
Christina T. Piedrahita ◽  
Annette L. Jencson ◽  
Emily L. Larkin ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Candida Species ◽  
Fungal Pathogen ◽  
Laboratory Testing ◽  
Multidrug Resistant ◽  
Relative Resistance ◽  
Candida Auris ◽  
Healthcare Facilities ◽  
Ultraviolet C ◽  
Uv C

Mobile ultraviolet-C (UV-C) light room decontamination devices are frequently used as an adjunct to standard cleaning in healthcare facilities, but their efficacy in killing Candida species is not clear. In laboratory testing, the emerging multidrug-resistant Candida auris and 2 other Candida species were significantly less susceptible to killing by UV-C than methicillin-resistant Staphylococcus aureus.Infect Control Hosp Epidemiol 2018;39:94–96

Understanding the effect of ultraviolet light intensity on disinfection performance through the use of ultraviolet measurements and simulation

2018 ◽  
Vol 39 (9) ◽  
pp. 1122-1124 ◽  
Author(s):  
Brian M. Tande ◽  
Todd A. Pringle ◽  
William A. Rutala ◽  
Maria F. Gergen ◽  
David J. Weber
Keyword(s):  
Clostridium Difficile ◽  
Light Intensity ◽  
Ultraviolet Light ◽  
Computer Simulations ◽  
Uv Light ◽  
Ultraviolet C ◽  
Uv C

AbstractWe measured the disinfection of MRSA and Clostridium difficile spores using an ultraviolet C (UV-C) device, and we correlated those results to measurements and computer simulations of UV-C surface intensity. The results demonstrate both large differences in UV light intensity across various surfaces and how this leads to significant differences in disinfection.

Ultraviolet-C (UV-C) monitoring made simple: Colorimetric indicators to assess delivery of UV-C light by room decontamination devices

2021 ◽  
pp. 1-6
Author(s):  
Jennifer L. Cadnum ◽  
Basya S. Pearlmutter ◽  
Sarah N. Redmond ◽  
Annette L. Jencson ◽  
Kevin J. Benner ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Laboratory Testing ◽  
Environmental Services ◽  
Dose Delivery ◽  
Methicillin Resistant ◽  
Light Delivery ◽  
Clostridioides Difficile ◽  
Device Placement ◽  
Ultraviolet C ◽  
Uv C

Abstract Objective: To evaluate the use of colorimetric indicators for monitoring ultraviolet-C (UV-C) light delivery to sites in patient rooms. Methods: In laboratory testing, we examined the correlation between changes in color of 2 commercial colorimetric indicators and log10 reductions in methicillin-resistant Staphylococcus aureus (MRSA) and Clostridioides difficile spores with exposure to increasing doses of UV-C from a low-pressure mercury room decontamination device. In patient rooms, 1 of the colorimetric indicators was used to assess UV-C dose delivery to 27 sites in the room. Results: In laboratory testing, the manufacturer’s reference colors for MRSA and C. difficile reduction corresponded with doses of ∼10,000 and 46,000 µJ/cm2; these doses resulted in >3 log10 reductions in MRSA and C. difficile spores, respectively. In patient rooms, the colorimetric indicators demonstrated suboptimal delivery of UV-C dosing to shadowed areas, which was improved by providing cycles on each side of the patient bed rather than in a single position and altering device placement. Increasing duration of exposure increased the number of sites achieving adequate dosing to kill C. difficile spores. Conclusions: Commercial colorimetric indicators provide rapid and easy-to-interpret information on the UV-C dose delivered to sites in patient rooms. The indicators may be useful for training environmental services personnel and optimizing the effectiveness of UV-C room decontamination devices.

scholarly journals UV Light-Irradiated Photocatalytic Degradation of Coffee Processing Wastewater Using TiO2 as a Catalyst

Environments ◽  
2020 ◽  
Vol 7 (6) ◽  
pp. 47 ◽  
Author(s):  
Gurudev Sujatha ◽  
Subramaniam Shanthakumar ◽  
Fulvia Chiampo
Keyword(s):  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Ultraviolet C ◽  
Catalyst Dosage ◽  
Uv C ◽  
Experimental Runs

The coffee industry generates a significant amount of wastewater that is rich in organic loads and is highly acidic. The present study investigates the potential of the heterogeneous photocatalytic oxidation process to reduce the pollutant load in coffee processing wastewater. The experimental runs were conducted to evaluate the effect of operative parameters such as pH, catalyst dosage, intensity of UV light irradiation, and addition of oxidant on Chemical Oxygen Demand (COD) and colour reduction. Significant results for COD and colour removal, 67%, and 70% respectively, were achieved at a pH of 4 with titanium dioxide (TiO2), and a catalyst dosage of 500 mg/L, using four ultraviolet-C (UV-C) lamps of 16 W each. With the addition of hydrogen peroxide (H2O2) as an oxidant, the removal efficiency increased to 84% and 75% for COD and colour, respectively. Finally, the best results obtained by photocatalytic degradation using UV light were compared to those using solar light. Based on the investigation, it was inferred that the pollutant removal efficiency in coffee pulping wastewater was also considerably high under sunlight. These findings may have relevance in terms of application in countries where coffee processing is carried out and where sunlight irradiance is usually strong: the technique could be exploited to decrease the pollutant content of this wastewater sustainably.

scholarly journals Decontamination of knives used in a slaughterhouse by a commercial non-thermal UV-C treatment

2019 ◽  
Vol 8 (2) ◽  
Author(s):  
Susanne Raschle ◽  
Claudio Zweifel ◽  
Katrin Zurfluh ◽  
Roger Stephan
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Effect ◽  
Negative Impact ◽  
Antimicrobial Effect ◽  
Central Importance ◽  
E Coli ◽  
Clean Area ◽  
Uv C ◽  
And Staphylococcus Aureus

To assess the antimicrobial effect of a commercial UV-C system, knives inoculated with Escherichia coli and Staphylococcus aureus as well as naturally contaminated and collected from the wet and clean area of a slaughterhouse knives were examined. For inoculated knives, UVC treatment for 30 s reduced mean E. coli counts by 5.1 log CFU cm-2 and mean S. aureus counts by 4.5 log CFU cm-2. The presence of blood lowered mean reductions to 3.4 log CFU cm-2 for E. coli and to 2.5 log CFU cm-2 for S. aureus. The presence of fat had a greater negative impact on the efficacy of the UV-C treatment resulting in mean reductions <1.8 log CFU cm-2. For naturally contaminated knives from a slaughterhouse, total viable counts (TVC) before UV-C treatment varied considerably (wet area: 2.0-6.0 log CFU cm-2, clean area: 1.0–3.0 log CFU cm-2). UV-C treatment for 30s reduced mean TVC by 0.8 log CFU cm-2 (wet area) and 0.6 log CFU cm-2 (clean area), but the effect varied greatly between individual knives. Thus, under commercial conditions, the antibacterial effect of UV-C for the decontamination of knives is affected by the presence of additional contaminations like blood or fat. The adequate cleaning of the knives prior to UV-C decontamination is therefore of central importance.

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