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. 2021 Aug 2;11(8):e045225. doi: 10.1136/bmjopen-2020-045225

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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(A) Cumulative COVID-19 diagnosis in the ski resort Schladming-Dachstein over time. The main outbreak occurred after a 3-day party event (13 to 15 March) celebrating the early termination of the skiing season due to national lockdown commencing on 16 March. Between 11 March (index case) and 03 April (last endemic case), eight people were diagnosed with acute infection (RT-qPCR-reactive, confirmed antibody positive) in the first half (12 days from 11 to 22 March 2020) of the outbreak (green colour), and seven people with late acute infection (amber) and seven people with convalescent infection (red) were detected during the second half; (B) mean duration of symptoms; (C) mean number of symptoms and (D) cumulative weekly numbers of confirmed COVID-19 cases during the outbreak. RT-qPCR was 100% sensitive among all early acute and late acute presenters. RT-qPCR did not detect any of the late convalescent presenters. RT-qPCR, real-time reverse transcriptase PCR.