1 Infection Biology Unit, German Primate Centre, Leibniz Institute for Primate Research, 37077 Göttingen, Germany; Faculty of Biology and Psychology, Georg-August-University Göttingen, Göttingen, Germany.
2 Infection Biology Unit, German Primate Centre, Leibniz Institute for Primate Research, 37077 Göttingen, Germany.
3 Division of Molecular Immunology, Department of Internal Medicine 3, Friedrich-Alexander University of Erlangen-Nürnberg, 91054 Erlangen, Germany.
4 Infection Biology Unit, German Primate Centre, Leibniz Institute for Primate Research, 37077 Göttingen, Germany; Faculty of Biology and Psychology, Georg-August-University Göttingen, Göttingen, Germany. Electronic address: mhoffmann@dpz.eu.