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Which factors influence the extent of indoor transmission of SARS-CoV-2? A rapid evidence review.
Goodwin, Lara; Hayward, Toneka; Krishan, Prerna; Nolan, Gemma; Nundy, Madhurima; Ostrishko, Kayla; Attili, Antonio; Cárceles, Salva Barranco; Epelle, Emmanuel I; Gabl, Roman; Pappa, Evanthia J; Stajuda, Mateusz; Zen, Simone; Dozier, Marshall; Anderson, Niall; Viola, Ignazio M; McQuillan, Ruth.
  • Goodwin L; Usher Institute, University of Edinburgh, Edinburgh, UK.
  • Hayward T; Usher Institute, University of Edinburgh, Edinburgh, UK.
  • Krishan P; Usher Institute, University of Edinburgh, Edinburgh, UK.
  • Nolan G; Usher Institute, University of Edinburgh, Edinburgh, UK.
  • Nundy M; Usher Institute, University of Edinburgh, Edinburgh, UK.
  • Ostrishko K; Usher Institute, University of Edinburgh, Edinburgh, UK.
  • Attili A; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • Cárceles SB; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • Epelle EI; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • Gabl R; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • Pappa EJ; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • Stajuda M; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • Zen S; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • Dozier M; Information Services, University of Edinburgh, Edinburgh, UK.
  • Anderson N; Usher Institute, University of Edinburgh, Edinburgh, UK.
  • Viola IM; School of Engineering, University of Edinburgh, Edinburgh, UK.
  • McQuillan R; Usher Institute, University of Edinburgh, Edinburgh, UK.
J Glob Health ; 11: 10002, 2021 Apr 03.
Artículo en Inglés | MEDLINE | ID: covidwho-1173057
ABSTRACT

BACKGROUND:

This rapid evidence review identifies and integrates evidence from epidemiology, microbiology and fluid dynamics on the transmission of SARS-CoV-2 in indoor environments.

METHODS:

Searches were conducted in May 2020 in PubMed, medRxiv, arXiv, Scopus, WHO COVID-19 database, Compendex & Inspec. We included studies reporting data on any indoor setting except schools, any indoor activities and any potential means of transmission. Articles were screened by a single reviewer, with rejections assessed by a second reviewer. We used Joanna Briggs Institute and Critical Appraisal Skills Programme tools for evaluating epidemiological studies and developed bespoke tools for the evaluation of study types not covered by these instruments. Data extraction and quality assessment were conducted by a single reviewer. We conducted a meta-analysis of secondary attack rates in household transmission. Otherwise, data were synthesised narratively.

RESULTS:

We identified 1573 unique articles. After screening and quality assessment, fifty-eight articles were retained for analysis. Experimental evidence from fluid mechanics and microbiological studies demonstrates that aerosolised transmission is theoretically possible; however, we found no conclusive epidemiological evidence of this occurring. The evidence suggests that ventilation systems have the potential to decrease virus transmission near the source through dilution but to increase transmission further away from the source through dispersal. We found no evidence for faecal-oral transmission. Laboratory studies suggest that the virus survives for longer on smooth surfaces and at lower temperatures. Environmental sampling studies have recovered small amounts of viral RNA from a wide range of frequently touched objects and surfaces; however, epidemiological studies are inconclusive on the extent of fomite transmission. We found many examples of transmission in settings characterised by close and prolonged indoor contact. We estimate a pooled secondary attack rate within households of 11% (95% confidence interval (CI) = 9, 13). There were insufficient data to evaluate the transmission risks associated with specific activities. Workplace challenges related to poverty warrant further investigation as potential risk factors for workplace transmission. Fluid mechanics evidence on the physical properties of droplets generated by coughing, speaking and breathing reinforce the importance of maintaining 2 m social distance to reduce droplet transmission.

CONCLUSIONS:

This review provides a snap-shot of evidence on the transmission of SARS-CoV-2 in indoor environments from the early months of the pandemic. The overall quality of the evidence was low. As the quality and quantity of available evidence grows, it will be possible to reach firmer conclusions on the risk factors for and mechanisms of indoor transmission.
Asunto(s)

Texto completo: Disponible Colección: Bases de datos internacionales Base de datos: MEDLINE Asunto principal: Monitoreo del Ambiente / Contaminación del Aire Interior / Transmisión de Enfermedad Infecciosa / Ambiente Controlado / COVID-19 Tipo de estudio: Estudio experimental / Estudio observacional / Estudio pronóstico / Revisiones Límite: Humanos Idioma: Inglés Revista: J Glob Health Año: 2021 Tipo del documento: Artículo País de afiliación: Jogh.11.10002

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Texto completo: Disponible Colección: Bases de datos internacionales Base de datos: MEDLINE Asunto principal: Monitoreo del Ambiente / Contaminación del Aire Interior / Transmisión de Enfermedad Infecciosa / Ambiente Controlado / COVID-19 Tipo de estudio: Estudio experimental / Estudio observacional / Estudio pronóstico / Revisiones Límite: Humanos Idioma: Inglés Revista: J Glob Health Año: 2021 Tipo del documento: Artículo País de afiliación: Jogh.11.10002