Nosocomial COVID-19 Incidence and Secondary Attack Rates among Patients of Tertiary Care Center, Zurich, Switzerland by Aline Wolfensberger, Verena Kufner, Maryam Zaheri, Marius Zeeb, Isabelle Nortes, Peter W. Schreiber, Miriam Vazquez, Verena Schärer, Thomas Scheier, Stefan Schmutz, Elisabeth Probst, Dirk Saleschus, Michael Huber, Silvana K. Rampini, Walter Zingg

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