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      Disinfection and decontamination in the context of SARS‐CoV‐2‐specific data

      review-article
      1 , 2 ,
      Journal of Medical Virology
      John Wiley and Sons Inc.
      COVID‐19, decontamination, disinfection, prevention, SARS‐CoV‐2

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          Abstract

          Given the high transmissibility of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) as witnessed early in the coronavirus disease 2019 (COVID‐19) pandemic, concerns arose with the existing methods for virus disinfection and decontamination. The need for SARS‐CoV‐2‐specific data stimulated considerable research in this regard. Overall, SARS‐CoV‐2 is practically and equally susceptible to approaches for disinfection and decontamination that have been previously found for other human or animal coronaviruses. The latter have included techniques utilizing temperature modulation, pH extremes, irradiation, and chemical treatments. These physicochemical methods are a necessary adjunct to other prevention strategies, given the environmental and patient surface ubiquity of the virus. Classic studies of disinfection have also allowed for extrapolation to the eradication of the virus on human mucosal surfaces by some chemical means. Despite considerable laboratory study, practical field assessments are generally lacking and need to be encouraged to confirm the correlation of interventions with viral eradication and infection prevention. Transparency in the constitution and use of any method or chemical is also essential to furthering practical applications.

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          Stability of SARS-CoV-2 in different environmental conditions

          We previously reported the detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in different clinical samples. 1 This virus can be detected on different surfaces in a contaminated site. 2 Here, we report the stability of SARS-CoV-2 in different environmental conditions. We first measured the stability of SARS-CoV-2 at different temperatures. SARS-CoV-2 in virus transport medium (final concentration ∼6·8 log unit of 50% tissue culture infectious dose [TCID50] per mL) was incubated for up to 14 days and then tested for its infectivity (appendix p 1). The virus is highly stable at 4°C, but sensitive to heat. At 4°C, there was only around a 0·7 log-unit reduction of infectious titre on day 14. With the incubation temperature increased to 70°C, the time for virus inactivation was reduced to 5 mins. We further investigated the stability of this virus on different surfaces. Briefly, a 5 μL droplet of virus culture (∼7·8 log unit of TCID50 per mL) was pipetted on a surface (appendix p 1; ∼cm2 per piece) and left at room temperature (22°C) with a relative humidity of around 65%. The inoculated objects retrieved at desired time-points were immediately soaked with 200 μL of virus transport medium for 30 mins to elute the virus. Therefore, this recovery of virus does not necessarily reflect the potential to pick up the virus from casual contact. No infectious virus could be recovered from printing and tissue papers after a 3-hour incubation, whereas no infectious virus could be detected from treated wood and cloth on day 2. By contrast, SARS-CoV-2 was more stable on smooth surfaces. No infectious virus could be detected from treated smooth surfaces on day 4 (glass and banknote) or day 7 (stainless steel and plastic). Strikingly, a detectable level of infectious virus could still be present on the outer layer of a surgical mask on day 7 (∼0·1% of the original inoculum). Interestingly, a biphasic decay of infectious SARS-CoV-2 could be found in samples recovered from these smooth surfaces (appendix pp 2–7). 39 representative non-infectious samples tested positive by RT-PCR 3 (data not shown), showing that non-infectious viruses could still be recovered by the eluents. We also tested the virucidal effects of disinfectants by adding 15 μL of SARS-CoV-2 culture (∼7·8 log unit of TCID50 per mL) to 135 μL of various disinfectants at working concentration (appendix p 1). With the exception of a 5-min incubation with hand soap, no infectious virus could be detected after a 5-min incubation at room temperature (22°C). Additionally, we also found that SARS-CoV-2 is extremely stable in a wide range of pH values at room temperature (pH 3–10; appendix p 1). Overall, SARS-CoV-2 can be highly stable in a favourable environment, 4 but it is also susceptible to standard disinfection methods.
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            Presence and infectivity of SARS-CoV-2 virus in wastewaters and rivers

            The presence of SARS-CoV-2 in raw wastewaters has been demonstrated in many countries affected by this pandemic. Nevertheless, virus presence and infectivity in treated wastewaters, but also in the receiving water bodies is still poorly investigated. In this study, raw and treated samples from three wastewater treatment plants, and three river samples within the Milano Metropolitan Area, Italy, were surveyed for SARS-CoV-2 RNA detection by means of real time RT-PCR and infectivity test on culture cells. SARS-CoV-2 RNA was detected in raw, but not in treated wastewaters (four and two samples, respectively, sampled in two dates). The isolated virus genome was sequenced, and belonged to the strain most spread in Europe and similar to another found in the same region. RNA presence in raw wastewater samples decreased after eight days, probably following the epidemiological trend estimated for the area. Virus infectivity was always null, indicating the natural decay of viral pathogenicity in time from emission. Samples from receiving rivers (three sites, sampled in the same dates as wastewaters) showed in some cases a positivity to real time RT-PCR, probably due to non-treated, or inefficiently treated discharges, or to the combined sewage overflows. Nevertheless, also for rivers infectivity was null. Risks for public health should be limited, although a precautionary approach to risk assessment is here advocated, giving the preliminary nature of the presented data.
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              Inactivation of Severe Acute Respiratory Syndrome Coronavirus 2 by WHO-Recommended Hand Rub Formulations and Alcohols

              Infection control instructions call for use of alcohol-based hand rub solutions to inactivate severe acute respiratory syndrome coronavirus 2. We determined the virucidal activity of World Health Organization–recommended hand rub formulations, at full strength and multiple dilutions, and of the active ingredients. All disinfectants demonstrated efficient virus inactivation.
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                Author and article information

                Contributors
                ncimolai@mail.ubc.ca
                Journal
                J Med Virol
                J Med Virol
                10.1002/(ISSN)1096-9071
                JMV
                Journal of Medical Virology
                John Wiley and Sons Inc. (Hoboken )
                0146-6615
                1096-9071
                18 July 2022
                18 July 2022
                : 10.1002/jmv.27959
                Affiliations
                [ 1 ] Department of Pathology and Laboratory Medicine, Faculty of Medicine The University of British Columbia Vancouver British Columbia Canada
                [ 2 ] Department of Pathology and Laboratory Medicine Children's and Women's Health Centre of British Columbia Vancouver British Columbia Canada
                Author notes
                [*] [* ] Correspondence Faculty of Medicine, The University of British Columbia, 4480 Oak Street Vancouver, Vancouver, BC V6H3V4, Canada.

                Email: ncimolai@ 123456mail.ubc.ca

                Author information
                http://orcid.org/0000-0003-2743-0556
                Article
                JMV27959
                10.1002/jmv.27959
                9350315
                35758523
                5904f2db-9796-4ce0-ba6c-4f03fd7f834b
                © 2022 Wiley Periodicals LLC.

                This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

                History
                : 13 June 2022
                : 24 January 2022
                : 24 June 2022
                Page count
                Figures: 0, Tables: 3, Pages: 15, Words: 9928
                Categories
                Review
                Reviews
                Custom metadata
                2.0
                corrected-proof
                Converter:WILEY_ML3GV2_TO_JATSPMC version:6.1.7 mode:remove_FC converted:04.08.2022

                Microbiology & Virology
                covid‐19,decontamination,disinfection,prevention,sars‐cov‐2
                Microbiology & Virology
                covid‐19, decontamination, disinfection, prevention, sars‐cov‐2

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