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  1. Article ; Online: Outdoor Transmission of SARS-CoV-2 and Other Respiratory Viruses: A Systematic Review.

    Bulfone, Tommaso Celeste / Malekinejad, Mohsen / Rutherford, George W / Razani, Nooshin

    The Journal of infectious diseases

    2020  Volume 223, Issue 4, Page(s) 550–561

    Abstract: ... to be low, there are limited data on SARS-CoV-2 transmission in outdoor compared to indoor settings ... of SARS-CoV-2. Reports of other respiratory virus transmission were included for reference.: Results ... confidence interval, 6.0-57.9). Five studies described influenza transmission outdoors and 2 adenovirus transmission ...

    Abstract Background: While risk of outdoor transmission of respiratory viral infections is hypothesized to be low, there are limited data on SARS-CoV-2 transmission in outdoor compared to indoor settings.
    Methods: We conducted a systematic review of peer-reviewed papers indexed in PubMed, EMBASE, and Web of Science and preprints in Europe PMC through 12 August 2020 that described cases of human transmission of SARS-CoV-2. Reports of other respiratory virus transmission were included for reference.
    Results: Five identified studies found a low proportion of reported global SARS-CoV-2 infections occurred outdoors (<10%) and the odds of indoor transmission was very high compared to outdoors (18.7 times; 95% confidence interval, 6.0-57.9). Five studies described influenza transmission outdoors and 2 adenovirus transmission outdoors. There was high heterogeneity in study quality and individual definitions of outdoor settings, which limited our ability to draw conclusions about outdoor transmission risks. In general, factors such as duration and frequency of personal contact, lack of personal protective equipment, and occasional indoor gathering during a largely outdoor experience were associated with outdoor reports of infection.
    Conclusions: Existing evidence supports the wide-held belief that risk of SARS-CoV-2 transmission is lower outdoors but there are significant gaps in our understanding of specific pathways.
    MeSH term(s) COVID-19/transmission ; Disease Transmission, Infectious ; Environmental Exposure ; Humans ; Risk Factors ; SARS-CoV-2/isolation & purification
    Language English
    Publishing date 2020-11-27
    Publishing country United States
    Document type Journal Article ; Systematic Review
    ZDB-ID 3019-3
    ISSN 1537-6613 ; 0022-1899
    ISSN (online) 1537-6613
    ISSN 0022-1899
    DOI 10.1093/infdis/jiaa742
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Clarification Regarding "Outdoor Transmission of SARS-CoV-2 and Other Respiratory Viruses: A Systematic Review".

    Razani, Nooshin / Malekinejad, Mohsen / Rutherford, George W

    The Journal of infectious diseases

    2021  Volume 224, Issue 5, Page(s) 925–926

    MeSH term(s) COVID-19/transmission ; Humans ; Respiratory System/virology ; SARS-CoV-2/pathogenicity ; Viruses/pathogenicity
    Language English
    Publishing date 2021-06-04
    Publishing country United States
    Document type Journal Article ; Systematic Review
    ZDB-ID 3019-3
    ISSN 1537-6613 ; 0022-1899
    ISSN (online) 1537-6613
    ISSN 0022-1899
    DOI 10.1093/infdis/jiab298
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: A review on measurements of SARS-CoV-2 genetic material in air in outdoor and indoor environments: Implication for airborne transmission

    Dinoi, Adelaide / Feltracco, Matteo / Chirizzi, Daniela / Trabucco, Sara / Conte, Marianna / Gregoris, Elena / Barbaro, Elena / La Bella, Gianfranco / Ciccarese, Giuseppina / Belosi, Franco / La Salandra, Giovanna / Gambaro, Andrea / Contini, Daniele

    Science of the total environment. 2022 Feb. 25, v. 809

    2022  

    Abstract: Airborne transmission of SARS-CoV-2 has been object of debate in the scientific community ... papers on experimental determination of SARS-CoV-2 RNA in air comparing different environments: outdoors ... however, the average positivity rate was lower compared to that of air. Concentrations of SARS-CoV-2 RNA in air were ...

    Abstract Airborne transmission of SARS-CoV-2 has been object of debate in the scientific community since the beginning of COVID-19 pandemic. This mechanism of transmission could arise from virus-laden aerosol released by infected individuals and it is influenced by several factors. Among these, the concentration and size distribution of virus-laden particles play an important role. The knowledge regarding aerosol transmission increases as new evidence is collected in different studies, even if it is not yet available a standard protocol regarding air sampling and analysis, which can create difficulties in the interpretation and application of results. This work reports a systematic review of current knowledge gained by 73 published papers on experimental determination of SARS-CoV-2 RNA in air comparing different environments: outdoors, indoor hospitals and healthcare settings, and public community indoors. Selected papers furnished 77 datasets: outdoor studies (9/77, 11.7%) and indoor studies (68/77. 88.3%). The indoor datasets in hospitals were the vast majority (58/68, 85.3%), and the remaining (10/68, 14.7%) were classified as community indoors. The fraction of studies having positive samples, as well as positivity rates (i.e. ratios between positive and total samples) are significantly larger in hospitals compared to the other typologies of sites. Contamination of surfaces was more frequent (in indoor datasets) compared to contamination of air samples; however, the average positivity rate was lower compared to that of air. Concentrations of SARS-CoV-2 RNA in air were highly variables and, on average, lower in outdoors compared to indoors. Among indoors, concentrations in community indoors appear to be lower than those in hospitals and healthcare settings.
    Keywords COVID-19 infection ; RNA ; Severe acute respiratory syndrome coronavirus 2 ; aerosols ; air ; airborne transmission ; data collection ; environment ; health services ; systematic review
    Language English
    Dates of publication 2022-0225
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2021.151137
    Database NAL-Catalogue (AGRICOLA)

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