Yuki Kaiki1, Hiroki Kitagawa2, Toshinori Hara3, Toshihito Nomura4, Keitaro Omori4, Norifumi Shigemoto5, Shinya Takahashi1, Hiroki Ohge6. 1. Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan. 2. Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan; Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan; Project Research Center for Nosocomial Infectious Diseases, Hiroshima University, Hiroshima, Japan. Electronic address: hkitaga@hiroshima-u.ac.jp. 3. Project Research Center for Nosocomial Infectious Diseases, Hiroshima University, Hiroshima, Japan; Section of Infection Diseases Laboratory, Department of Clinical Support, Hiroshima University Hospital, Hiroshima, Japan. 4. Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan. 5. Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan; Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan; Project Research Center for Nosocomial Infectious Diseases, Hiroshima University, Hiroshima, Japan; Translational Research Center, Hiroshima University, Hiroshima, Japan. 6. Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan; Project Research Center for Nosocomial Infectious Diseases, Hiroshima University, Hiroshima, Japan.
Abstract
BACKGROUND: Mobile phones may be contaminated with nosocomial pathogens such as methicillin-resistant Staphylococcus aureus (MRSA). The aim of this study was to investigate the MRSA contamination rate on doctors' hospital-use-only mobile phones and the efficacy of 222-nm ultraviolet light (UV) disinfection. METHODS: We investigated the MRSA contamination rate of doctors' hospital-use-only mobile phones, as well as the reduction in MRSA counts on plastic plates and aerobic bacteria (AB) on mobile phones before and after exposure to 222-nm UV irradiation. RESULTS: Five (10%) of the 50 mobile phones investigated were contaminated with MRSA. Exposure to 0.1 mJ/cm2 222-nm UVC irradiation for 1.5 and 2.5 min (9 and 15 mJ/cm2) achieved mean log10 MRSA colony-forming units reductions of 2.91 and 3.95, respectively. Exposure to 9 mJ/cm2 222-nm UVC irradiation (0.1 mW/cm2 for 1.5 minutes) significantly reduced AB contamination on mobile phones (P < .001). CONCLUSIONS: The use of 222-nm UV disinfection resulted in effective in vitro reduction of MRSA and significantly reduced AB contamination of mobile phone surfaces.
BACKGROUND: Mobile phones may be contaminated with nosocomial pathogens such as methicillin-resistant Staphylococcus aureus (MRSA). The aim of this study was to investigate the MRSA contamination rate on doctors' hospital-use-only mobile phones and the efficacy of 222-nm ultraviolet light (UV) disinfection. METHODS: We investigated the MRSA contamination rate of doctors' hospital-use-only mobile phones, as well as the reduction in MRSA counts on plastic plates and aerobic bacteria (AB) on mobile phones before and after exposure to 222-nm UV irradiation. RESULTS: Five (10%) of the 50 mobile phones investigated were contaminated with MRSA. Exposure to 0.1 mJ/cm2 222-nm UVC irradiation for 1.5 and 2.5 min (9 and 15 mJ/cm2) achieved mean log10 MRSA colony-forming units reductions of 2.91 and 3.95, respectively. Exposure to 9 mJ/cm2 222-nm UVC irradiation (0.1 mW/cm2 for 1.5 minutes) significantly reduced AB contamination on mobile phones (P < .001). CONCLUSIONS: The use of 222-nm UV disinfection resulted in effective in vitro reduction of MRSA and significantly reduced AB contamination of mobile phone surfaces.
Authors: Margaret Lubwama; David P Kateete; Kirabo Tess Ayazika; Winnie Nalwanga; Douglas Bruno Kagambo; Mayanja David Nsubuga; Arnold Kingston Arach; Leoson Junior Ssetaba; Joyce N Wamala; Leah Amaro Rwot; Henry Kajumbula Journal: Adv Med Educ Pract Date: 2021-10-28
Authors: Aída Hamdan-Partida; Samuel González-García; Francisco Javier Martínez-Ruíz; Miguel Ángel Zavala-Sánchez; Anaíd Bustos-Hamdan; Jaime Bustos-Martínez Journal: Microorganisms Date: 2022-03-21