Abstract
BackgroundDisinfection of contaminated or potentially contaminated surfaces has become an integral part of the mitigation strategies for controlling coronavirus disease 2019. Whilst a broad range of disinfectants are effective in inactivating severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), application of disinfectants has a low throughput in areas that receive treatments. Disinfection of large surface areas often involves the use of reactive microbiocidal materials, including ultraviolet germicidal irradiation, chlorine dioxide, and hydrogen peroxide vapor. Albeit these methods are highly effective in inactivating SARS-CoV-2, the deployment of these approaches creates unacceptable health hazards and precludes the treatment of occupied indoor spaces using existing disinfection technologies. In this study, the feasibility of using dry hydrogen peroxide (DHP) in inactivating SARS-CoV-2 on contaminated surfaces in large indoor spaces was evaluated.MethodsGlass slides were inoculated with SARS-CoV-2 and treated with DHP between 5 and 25 ppb for up to 24 hours. Residual infectious virus samples were eluted from three replicates at each time point and titrated in African green monkey VeroE6 cells.ResultsIn comparison with the observed relatively high stability of SARS-CoV-2 on contaminated glass slides (control group), residual infectious titers of glass slides inoculated with SARS-CoV-2 were significantly reduced after receiving 120 minutes of DHP treatment.ConclusionsThe accelerated decay of SARS-CoV-2 on contaminated glass slides suggests that treatment with DHP can be an effective surface disinfection method for occupied indoor spaces
Highlights
Disinfection of contaminated or potentially contaminated surfaces has become an integral part of the mitigation strategies for controlling coronavirus disease 2019
Contaminated glass slides were used to determine the decay of residual infectious titers after the initiation of dry hydrogen peroxide (DHP) treatment and compared to slides in the control group, which did not receive DHP treatment
Three contaminated glass slides were randomly assigned as a set, placed inside a 100 mm x 100 mm square petri dishes, sealed with parafilm and transported to two biosafety level-3 large animal (BSL-3Ag) laboratories that are each 50 m2 in size
Summary
Disinfection of contaminated or potentially contaminated surfaces has become an integral part of the mitigation strategies for controlling coronavirus disease 2019. Disinfection of large surface areas often involves the use of reactive microbiocidal materials, including ultraviolet germicidal irradiation, chlorine dioxide, and hydrogen peroxide vapor. Albeit these methods are highly effective in inactivating SARS-CoV-2, the deployment of these approaches creates unacceptable health hazards and precludes the treatment of occupied indoor spaces using existing disinfection technologies. Results: In comparison with the observed relatively high stability of SARS-CoV-2 on contaminated glass slides (control group), residual infectious titers of glass slides inoculated with SARS-CoV-2 were significantly reduced after receiving 120 minutes of DHP treatment.
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