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Comparison of Surface Persistence of SARS-CoV-2 Alpha and Delta Variants on Stainless Steel at 4°C and 24°C.
Onianwa, Okechukwu; Garratt, Isobel; Carter, Jennifer; Spencer, Antony; Verlander, Neville Q; Pottage, Thomas; Bennett, Allan M.
Afiliación
  • Onianwa O; Research and Evaluation, UK Health Security Agency, Porton Down, United Kingdom.
  • Garratt I; Research and Evaluation, UK Health Security Agency, Porton Down, United Kingdom.
  • Carter J; Research and Evaluation, UK Health Security Agency, Porton Down, United Kingdom.
  • Spencer A; Research and Evaluation, UK Health Security Agency, Porton Down, United Kingdom.
  • Verlander NQ; Statistics, Modelling and Economics Department, UK Health Security Agency, United Kingdom.
  • Pottage T; Research and Evaluation, UK Health Security Agency, Porton Down, United Kingdom.
  • Bennett AM; Research and Evaluation, UK Health Security Agency, Porton Down, United Kingdom.
Appl Environ Microbiol ; 88(14): e0076422, 2022 07 26.
Article en En | MEDLINE | ID: mdl-35867558
Most studies on surface persistence of SARS-CoV-2 have been conducted at temperatures between 20°C and 30°C. There is limited data on the survival of SARS-CoV-2 at low temperatures. In this study, the stability of SARS-CoV-2 Alpha and Delta variants on stainless steel was investigated at two temperatures (4°C and 24°C). The results show that both variants decayed more rapidly at 24°C compared with 4°C. At 24°C, Alpha and Delta variants showed reductions of 0.33 log10 and 1.02 log10, respectively, within the first 2.5 h. However, at 4°C, Alpha variant showed a reduction of 0.16 log10 within the first 2.5 h while no reduction was observed with Delta variant. After remaining in situ for 24 h at 24°C, log10 reductions of 2.66 (Alpha) and 3.11 (Delta) were observed. No viable Alpha and Delta variant was recovered after 48 h and 72 h, respectively. After 24 h in a refrigerated environment (4°C) log10 reductions of 1.16 (Alpha) and 0.95 (Delta) were observed. Under these experimental conditions, both viruses survived on stainless steel for at least 1 week. No viable Alpha and Delta variant was recovered after 10 days. These findings support the potential for increased fomite transmission of SARS-CoV-2 during winter months in colder regions worldwide and in some industrial sectors. IMPORTANCE Human transmission is believed to occur primarily through direct transfer of infectious droplets or aerosols. However, fomite transmission through contact with contaminated surfaces may also play an important role. This study provides novel evidence comparing the stability of Alpha and Delta variants on stainless steel surfaces at 4°C and 24°C. At 4°C both variants were found to be still detectable for up to 7 days. At 24°C Delta variant could be recovered over 2 days compared with Alpha variant which could not be recovered after 2 days. This has implications for fomite transmission interventions for people living and working in cold environments.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Contexto en salud: 4_TD Problema de salud: 4_pneumonia Asunto principal: SARS-CoV-2 / COVID-19 Límite: Humans Idioma: En Revista: Appl Environ Microbiol Año: 2022 Tipo del documento: Article País de afiliación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Contexto en salud: 4_TD Problema de salud: 4_pneumonia Asunto principal: SARS-CoV-2 / COVID-19 Límite: Humans Idioma: En Revista: Appl Environ Microbiol Año: 2022 Tipo del documento: Article País de afiliación: Reino Unido
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