The study was already pre-published in May 2020 to meet the demand of scientific journals to make findings about COVID-19 available to science and the public as early as possible.
Publication: Infection fatality rate of SARS-CoV-2 infection in a German community with a super-spreading event; Hendrik Streeck, Bianca Schulte, Beate M. Kümmerer, Enrico Richter, Tobias Höller, Christine Fuhrmann, Eva Bartok, Ramona Dolscheid, Moritz Berger, Lukas Wessendorf, Monika Eschbach-Bludau, Angelika Kellings, Astrid Schwaiger, Martin Coenen, Per Hoffmann, Birgit Stoffel-Wagner, Markus M. Nöthen, Anna-Maria Eis-Hübinger, Martin Exner, Ricarda Maria Schmithausen, Matthias Schmid and Gunther Hartmann; Nature Communications, DOI: http://dx.doi.org/10.1038/s41467-020-19509-y
Article in Nature: https://www.nature.com/articles/s41467-020-19509-y