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1. Evaluation of environmental conditions as a decontamination approach for SARS‐CoV‐2 when applied to common library, archive and museum‐related materials.

Author

Richter, William R., Sunderman, Michelle M., Mera, Tom O., O'Brien, Kim A., Morgan, Kendra, and Streams, Sharon

Subjects
*SARS-CoV-2, *POROUS materials, *ARCHIVES, *HUMIDITY, *LIBRARY materials
Abstract

Aims: The purpose of this study was to evaluate the effects of ambient or altered environmental conditions on the inactivation of SARS‐CoV‐2 applied to materials common in libraries, archives and museums. Methods and Results: Porous and non‐porous materials (e.g. paper, plastic protective book cover) were inoculated with approximately 1 × 105 TCID50 SARS CoV‐2 (USA‐WA1/2020), dried, placed within test chamber in either a stacked or unstacked configuration, and exposed to environmental conditions ranging from 4 to 29°C at 40 ± 10% relative humidity. The amount of infectious SARS‐CoV‐2 was then assessed at various timepoints from 0 to 10 days. Ambient conditions resulted in varying inactivation rates per material type. Virus inactivation rate decreased when materials were stacked or at colder temperatures. Virus inactivation rate increased when materials were unstacked or at warmer temperatures. Conclusions: SARS‐CoV‐2 at ambient conditions resulted in the inactivation of virus below limit of quantitation (LOQ) for all materials by Day 8. Warmer temperatures, for a subset of materials, increased SARS‐CoV‐2 inactivation, and all were

Published
2022
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2. Why does SARS-CoV-2 survive longer on plastic than on paper?

Author

Denis E. Corpet, ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
0301 basic medicine, Swine, [SDV]Life Sciences [q-bio], viruses, 02 engineering and technology, 01 natural sciences, Inactivation, chemistry.chemical_compound, 0302 clinical medicine, Mechanisms, Composite material, Dehydration, General Medicine, 021001 nanoscience & nanotechnology, virology, 3. Good health, Surface, Fomites, visual_art, visual_art.visual_art_medium, Dryness, medicine.symptom, 0210 nano-technology, Plastics, Porosity, Paper, Materials science, Coronavirus disease 2019 (COVID-19), Surface Properties, Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), In Vitro Techniques, 010402 general chemistry, Models, Biological, Article, Pig skin, Persistence, 03 medical and health sciences, medicine, Animals, Humans, Enveloped virus, Polypropylene, SARS-CoV-2, technology, industry, and agriculture, COVID-19, Water, Humidity, cardboard, 0104 chemical sciences, Coronavirus, 030104 developmental biology, chemistry, Virus Inactivation, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, Adsorption, Porous medium, 030217 neurology & neurosurgery
Abstract

International audience; The Covid-19 coronavirus, SARS-CoV-2, is inactivated much faster on paper (3 h) than on plastic (7 d). By classifying materials according to virus stability on their surface, the following list is obtained (from long to short stability): polypropylene (mask), plastic, glass, stainless steel, pig skin, cardboard, banknote, cotton, wood, paper, tissue, copper. These observations and other studies suggest that SARS-CoV-2 may be inactivated by dryness on water absorbent porous materials but sheltered by long-persisting micro-droplets of water on waterproof surfaces. If such physical phenomenons were confirmed by direct evidence, the persistence of the virus on any surface could be predicted, and new porous objects could be designed to eliminate the virus faster.

Published
2021