tetano
Editor, Senior Moderator
J Infect
. 2021 May 29;S0163-4453(21)00273-5.
doi: 10.1016/j.jinf.2021.05.030. Online ahead of print.
Evidence for lack of transmission by close contact and surface touch in a restaurant outbreak of COVID-19
Nan Zhang[SUP] 1 [/SUP], Xuguang Chen[SUP] 2 [/SUP], Wei Jia[SUP] 3 [/SUP], Tianyi Jin[SUP] 1 [/SUP], Shenglan Xiao[SUP] 4 [/SUP], Wenzhao Chen[SUP] 3 [/SUP], Jian Hang[SUP] 5 [/SUP], Cuiyun Ou[SUP] 5 [/SUP], Hao Lei[SUP] 6 [/SUP], Hua Qian[SUP] 7 [/SUP], Boni Su[SUP] 8 [/SUP], Jiansen Li[SUP] 2 [/SUP], Dongmei Liu[SUP] 9 [/SUP], Weirong Zhang[SUP] 1 [/SUP], Peng Xue[SUP] 1 [/SUP], Jiaping Liu[SUP] 1 [/SUP], Louise B Weschler[SUP] 10 [/SUP], Jingchao Xie[SUP] 11 [/SUP], Yuguo Li[SUP] 12 [/SUP], Min Kang[SUP] 13 [/SUP]
Affiliations
Abstract
Background: 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.
Methods: 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.
Results: 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.
Conclusions: 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.
Keywords: Airborne; Close contact; Covid-19; Fomite; Human behaviour.
. 2021 May 29;S0163-4453(21)00273-5.
doi: 10.1016/j.jinf.2021.05.030. Online ahead of print.
Evidence for lack of transmission by close contact and surface touch in a restaurant outbreak of COVID-19
Nan Zhang[SUP] 1 [/SUP], Xuguang Chen[SUP] 2 [/SUP], Wei Jia[SUP] 3 [/SUP], Tianyi Jin[SUP] 1 [/SUP], Shenglan Xiao[SUP] 4 [/SUP], Wenzhao Chen[SUP] 3 [/SUP], Jian Hang[SUP] 5 [/SUP], Cuiyun Ou[SUP] 5 [/SUP], Hao Lei[SUP] 6 [/SUP], Hua Qian[SUP] 7 [/SUP], Boni Su[SUP] 8 [/SUP], Jiansen Li[SUP] 2 [/SUP], Dongmei Liu[SUP] 9 [/SUP], Weirong Zhang[SUP] 1 [/SUP], Peng Xue[SUP] 1 [/SUP], Jiaping Liu[SUP] 1 [/SUP], Louise B Weschler[SUP] 10 [/SUP], Jingchao Xie[SUP] 11 [/SUP], Yuguo Li[SUP] 12 [/SUP], Min Kang[SUP] 13 [/SUP]
Affiliations
- PMID: 34062182
- PMCID: PMC8164346
- DOI: 10.1016/j.jinf.2021.05.030
Abstract
Background: 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.
Methods: 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.
Results: 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.
Conclusions: 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.
Keywords: Airborne; Close contact; Covid-19; Fomite; Human behaviour.