tetano
Editor, Senior Moderator
Open Forum Infect Dis
. 2020 Jun 12;7(6)
faa231.
doi: 10.1093/ofid/ofaa231. eCollection 2020 Jun.
A Cluster of Novel Coronavirus Disease 2019 Infections Indicating Person-to-Person Transmission Among Casual Contacts From Social Gatherings: An Outbreak Case-Contact Investigation
Ye Shen[SUP] 1 [/SUP], Wenjie Xu[SUP] 2 [/SUP], Changwei Li[SUP] 1 3 [/SUP], Andreas Handel[SUP] 1 4 5 [/SUP], Leonardo Martinez[SUP] 6 [/SUP], Feng Ling[SUP] 7 [/SUP], Mark Ebell[SUP] 1 [/SUP], Xiaofei Fu[SUP] 8 [/SUP], Jinren Pan[SUP] 7 [/SUP], Jiangping Ren[SUP] 7 [/SUP], Weiling Gu[SUP] 8 [/SUP], Enfu Chen[SUP] 7 [/SUP]
AffiliationsExpand
Abstract
Background: Severe acute respiratory syndrome coronavirus 2, the pathogen causing novel coronavirus disease of 2019 (COVID-19), efficiently spreads from person to person in close contact settings. Transmission among casual contacts in settings such as during social gatherings is not well understood.
Methods: We report several transmission events to both close and casual contacts from a cluster of 7 COVID-19 cases occurring from mid-January to early February 2020. A total of 539 social and family contacts of the index patient's, including members of a 2-day wedding and a family party, were contacted and screened through epidemiologic surveys. The clinical progression of all cases is described.
Results: We estimate the secondary attack rate among close contacts to be 29% (2 of 7) and for the casual contacts to be 0.6% (3 of 473). The incubation period of our case cluster was 4-12 days (median, 7 days).
Conclusions: Transmission efficiency among close contacts was higher than among casual contacts; however, transmission from second-generation cases may help spread the virus during the incubation period.
Keywords: COVID-19; attack rate; casual contact; cluster; social gathering.
. 2020 Jun 12;7(6)
faa231.doi: 10.1093/ofid/ofaa231. eCollection 2020 Jun.
A Cluster of Novel Coronavirus Disease 2019 Infections Indicating Person-to-Person Transmission Among Casual Contacts From Social Gatherings: An Outbreak Case-Contact Investigation
Ye Shen[SUP] 1 [/SUP], Wenjie Xu[SUP] 2 [/SUP], Changwei Li[SUP] 1 3 [/SUP], Andreas Handel[SUP] 1 4 5 [/SUP], Leonardo Martinez[SUP] 6 [/SUP], Feng Ling[SUP] 7 [/SUP], Mark Ebell[SUP] 1 [/SUP], Xiaofei Fu[SUP] 8 [/SUP], Jinren Pan[SUP] 7 [/SUP], Jiangping Ren[SUP] 7 [/SUP], Weiling Gu[SUP] 8 [/SUP], Enfu Chen[SUP] 7 [/SUP]
AffiliationsExpand
- PMID: 32613025
- PMCID: PMC7313868
- DOI: 10.1093/ofid/ofaa231
Abstract
Background: Severe acute respiratory syndrome coronavirus 2, the pathogen causing novel coronavirus disease of 2019 (COVID-19), efficiently spreads from person to person in close contact settings. Transmission among casual contacts in settings such as during social gatherings is not well understood.
Methods: We report several transmission events to both close and casual contacts from a cluster of 7 COVID-19 cases occurring from mid-January to early February 2020. A total of 539 social and family contacts of the index patient's, including members of a 2-day wedding and a family party, were contacted and screened through epidemiologic surveys. The clinical progression of all cases is described.
Results: We estimate the secondary attack rate among close contacts to be 29% (2 of 7) and for the casual contacts to be 0.6% (3 of 473). The incubation period of our case cluster was 4-12 days (median, 7 days).
Conclusions: Transmission efficiency among close contacts was higher than among casual contacts; however, transmission from second-generation cases may help spread the virus during the incubation period.
Keywords: COVID-19; attack rate; casual contact; cluster; social gathering.