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Outbreak investigation of airborne transmission of Omicron (B.1.1.529) - SARS-CoV-2 variant of concern in a restaurant: Implication for enhancement of indoor air dilution.
Cheng, Vincent Chi-Chung; Lung, David Christopher; Wong, Shuk-Ching; Au, Albert Ka-Wing; Wang, Qun; Chen, Hong; Xin, Li; Chu, Allen Wing-Ho; Ip, Jonathan Daniel; Chan, Wan-Mui; Tsoi, Hoi-Wah; Tse, Herman; Ng, Ken Ho-Leung; Kwan, Mike Yat-Wah; Chuang, Shuk-Kwan; To, Kelvin Kai-Wang; Li, Yuguo; Yuen, Kwok-Yung.
  • Cheng VC; Infection Control Team, Queen Mary Hospital, Hong Kong West Cluster, Hong Kong Special Administrative Region, China; Department of Microbiology, Queen Mary Hospital, Hong Kong Special Administrative Region, China.
  • Lung DC; Department of Pathology, Queen Elizabeth Hospital, Hong Kong Special Administrative Region, China.
  • Wong SC; Infection Control Team, Queen Mary Hospital, Hong Kong West Cluster, Hong Kong Special Administrative Region, China.
  • Au AK; Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region, China.
  • Wang Q; Department of Mechanical Engineering, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Chen H; Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region, China.
  • Xin L; Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Chu AW; Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Ip JD; Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Chan WM; Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Tsoi HW; Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Tse H; Department of Pathology, Hong Kong Children's Hospital, Hong Kong Special Administrative Region, China.
  • Ng KH; Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region, China.
  • Kwan MY; Department of Paediatrics and Adolescent Medicine, Princess Margaret Hospital, Hong Kong Special Administrative Region, China.
  • Chuang SK; Centre for Health Protection, Department of Health, Hong Kong Special Administrative Region, China.
  • To KK; Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Li Y; Department of Mechanical Engineering, The University of Hong Kong, Hong Kong Special Administrative Region, China.
  • Yuen KY; Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China. Electronic address: kyyuen@hku.hk.
J Hazard Mater ; 430: 128504, 2022 05 15.
Article in English | MEDLINE | ID: covidwho-1693278
ABSTRACT
Airborne transmission of SARS-CoV-2 has been increasingly recognized in the outbreak of COVID-19, especially with the Omicron variant. We investigated an outbreak due to Omicron variant in a restaurant. Besides epidemiological and phylogenetic analyses, the secondary attack rates of customers of restaurant-related COVID-19 outbreak before (Outbreak R1) and after enhancement of indoor air dilution (Outbreak R2) were compared. On 27th December 2021, an index case stayed in restaurant R2 for 98 min. Except for 1 sitting in the same table, six other secondary cases sat in 3 corners at 3 different zones, which were served by different staff. The median exposure time was 34 min (range 19-98 min). All 7 secondary cases were phylogenetically related to the index. Smoke test demonstrated that the airflow direction may explain the distribution of secondary cases. Compared with an earlier COVID-19 outbreak in another restaurant R1 (19th February 2021), which occurred prior to the mandatory enhancement of indoor air dilution, the secondary attack rate among customers in R2 was significantly lower than that in R1 (3.4%, 7/207 vs 28.9%, 22/76, p<0.001). Enhancement of indoor air dilution through ventilation and installation of air purifier could minimize the risk of SARS-CoV-2 transmission in the restaurants.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Air Pollution, Indoor / COVID-19 Type of study: Randomized controlled trials Topics: Variants Limits: Humans Language: English Journal: J Hazard Mater Journal subject: Environmental Health Year: 2022 Document Type: Article Affiliation country: J.jhazmat.2022.128504

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Air Pollution, Indoor / COVID-19 Type of study: Randomized controlled trials Topics: Variants Limits: Humans Language: English Journal: J Hazard Mater Journal subject: Environmental Health Year: 2022 Document Type: Article Affiliation country: J.jhazmat.2022.128504