1 Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
2 Institute of Medical Virology, University of Zurich, Zurich, Switzerland.
3 Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland. clement.vulin@usz.ch.
4 Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092, Zurich, Switzerland. clement.vulin@usz.ch.
5 Department of Environmental Microbiology, 8600, Eawag, Dubendorf, Switzerland. clement.vulin@usz.ch.