1. Robert Koch Institute, Department for Infectious Disease Epidemiology, Division of Gastrointestinal Infections, Zoonoses and Tropical Infections, Berlin, Germany
2. Bernhard Nocht Institute for Tropical Medicine, WHO Collaborating Centre for Arbovirus and Haemorrhagic Fever Reference and Research, Hamburg, Germany
3. These authors contributed equally to this work
4. German Centre for Infection Research (DZIF), partner site Hamburg-Luebeck-Borstel, Hamburg, Germany