1 NF Gamaleya National Research Centre for Epidemiology and Microbiology, Moscow, Russia.
2 Norwich Medical School, University of East Anglia, Norwich, UK.
3 Department of Microbiology and Immunology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
4 Institute for Virology, University Hospital Essen, University Duisburg-Essen, Essen, Germany.
5 Fundação Oswaldo Cruz - FIOCRUZ, Instituto Aggeu Magalhães-IAM, Department of Virology and Experimental Therapeutics, Recife, Brazil; University of Pittsburgh, School of Public Health, Department of Infectious Diseases, Pittsburgh, PA, USA.
6 CNRS, INSERM, Institut de Pharmacologie Moleculaire et Cellulaire, Université Nice Sophia Antipolis, Nice, France.
7 Wistar Institute, Philadelphia, PA 19104, USA. Electronic address: ertl@wistar.org.