1. Infection Biology Unit, German Primate Center, Göttingen, Germany
2. Faculty of Biology and Psychology, University of Göttingen, Göttingen, Germany
3. Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
4. Institute of Virology, Charité-Universitätsmedizin Berlin, Berlin, Germany
5. German Centre for Infection Research, associated partner Charité, Berlin, Germany