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1 Abteilung Virologie, Institut für Medizinische Mikrobiologie und Hygiene, University of Freiburg, Hermann-Herder-Str. 11, D-79104 Freiburg, Germany1.
2 Institut für Veterinärpathologie, University of Zürich, Winterthurerstr. 266a, CH-8057 Zürich, Switzerland2.
1 Abteilung Virologie, Institut für Medizinische Mikrobiologie und Hygiene, University of Freiburg, Hermann-Herder-Str. 11, D-79104 Freiburg, Germany1.
2 Institut für Veterinärpathologie, University of Zürich, Winterthurerstr. 266a, CH-8057 Zürich, Switzerland2.