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Volume 28, Number 5—May 2022

Epidemiologic and Genomic Analysis of SARS-CoV-2 Delta Variant Superspreading Event in Nightclub, the Netherlands, June 2021

Jelle Koopsen1Comments to Author , Catharina E. van Ewijk1, Roisin Bavalia, Akke Cornelissen, Sylvia M. Bruisten, Floor de Gee, Alvin X. Han, Maarten de Jong, Menno D. de Jong, Marcel Jonges, Norin Khawaja, Fleur M.H.P.A. Koene, Mariken van der Lubben, Iris Mikulic, Sjoerd P.H. Rebers, Colin A. Russell, Janke Schinkel, Anja J.M. Schreijer, Judith A. den Uil, Matthijs R.A. Welkers, Tjalling Leenstra, and on behalf of the ARGOS consortium
Author affiliations: Amsterdam University Medical Centres, University of Amsterdam, Amsterdam, the Netherlands (J. Koopsen, A.X. Han, M.D. de Jong, M. Jonges, S.P.H. Rebers, C.A. Russell, J. Schinkel, M.R.A. Welkers); Public Health Service Amsterdam, the Netherlands. (C.E. van Ewijk, R. Bavalia, A. Cornelissen, S.M. Bruisten, F. de Gee, M. de Jong, N. Khawaja, F.M.H.P.A. Koene, M. van der Lubben, I. Mikulic, A.J.M. Schreijer, J.A. den Uil, M.R.A. Welkers, T. Leenstra)

Main Article


Descriptive statistics of 60 persons with confirmed SARS-CoV-2 infection after nightclub event, Amsterdam, the Netherlands, June 2021*

Characteristics No. (%)
F 34 (60)
M 23 (40)
Mean age, y (SD) 21.1 (3.3)
Symptomatic 55 (93)
Asymptomatic 4 (7)
Vaccination status
Fully vaccinated† 4 (7.4)
Incomplete vaccination 9 (17)
No vaccination received 41 (76)
PHS Region
PHS Amsterdam 33 (57)
Other PHS Region 25 (43)
Other self-reported potential sources
None: only nightclub on June 26th 35 (61)
Other hospitality sector 17 (30)
Education 1 (1.8)
Social gathering 2 (3.5)
Supermarket 1 (1.8)
Vaccination location 1 (1.8)
Unknown 3

*PHS, Public Health Service; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2. †Fully vaccinated defined as 14 days after completion of vaccination series.

Main Article

1These authors contributed equally to this article.

Page created: February 18, 2022
Page updated: April 19, 2022
Page reviewed: April 19, 2022
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