1. Bernhard Nocht Institute for Tropical Medicine, WHO Collaborating Centre for Arbovirus and Haemorrhagic Fever Reference and Research, Hamburg, Germany
2. These authors contributed equally to this work
3. Institute of Virology, Saarland University Medical Center, Homburg/Saar, Germany
4. Internal Medicine I, Saarland University Medical Center, Homburg/Saar, Germany
5. German Centre for Infection Research (DZIF), partner site Hamburg-Luebeck-Borstel, Hamburg, Germany