1 Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Virology, 10117 Berlin, Germany.
2 Hospital Universitário Professor Edgard Santos, Universidade Federal de Bahia, Salvador, Brazil.
3 Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Virology, 10117 Berlin, Germany; German Centre for Infection Research (DZIF), associated partner Charité-Universitätsmedizin Berlin, Berlin, Germany. Electronic address: felix.drexler@charite.de.