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Evidence for lack of transmission by close contact and surface touch in a restaurant outbreak of COVID-19.

Authors :
Zhang, Nan
Chen, Xuguang
Jia, Wei
Jin, Tianyi
Xiao, Shenglan
Chen, Wenzhao
Hang, Jian
Ou, Cuiyun
Lei, Hao
Qian, Hua
Su, Boni
Li, Jiansen
Liu, Dongmei
Zhang, Weirong
Xue, Peng
Liu, Jiaping
Weschler, Louise B.
Xie, Jingchao
Li, Yuguo
Kang, Min
Source :
Journal of Infection; Aug2021, Vol. 83 Issue 2, p207-216, 10p
Publication Year :
2021

Abstract

<bold>Background: </bold>Coronavirus disease 2019 (COVID-19) is primarily a respiratory disease that has become a global pandemic. Close contact plays an important role in infection spread, while fomite may also be a possible transmission route. Research during the COVID-19 pandemic has identified long-range airborne transmission as one of the important transmission routes although lack solid evidence.<bold>Methods: </bold>We examined video data related to a restaurant associated COVID-19 outbreak in Guangzhou. We observed more than 40,000 surface touches and 13,000 episodes of close contacts in the restaurant during the entire lunch duration. These data allowed us to analyse infection risk via both the fomite and close contact routes.<bold>Results: </bold>There is no significant correlation between the infection risk via both fomite and close contact routes among those who were not family members of the index case. We can thus rule out virus transmission via fomite contact and interpersonal close contact routes in the Guangzhou restaurant outbreak. The absence of a fomite route agrees with the COVID-19 literature.<bold>Conclusions: </bold>These results provide indirect evidence for the long-range airborne route dominating SARS-CoV-2 transmission in the restaurant. We note that the restaurant was poorly ventilated, allowing for increasing airborne SARS-CoV-2 concentration. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01634453
Volume :
83
Issue :
2
Database :
Supplemental Index
Journal :
Journal of Infection
Publication Type :
Academic Journal
Accession number :
151557752
Full Text :
https://doi.org/10.1016/j.jinf.2021.05.030