1. Department of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
2. Department of Molecular Cell Biology, Section of Electron Microscopy, Leiden University Medical Centre, Leiden, the Netherlands
3. Institute of Pathology, University Medical Centre, Johannes Gutenberg University, Mainz, Germany
4. Rocky Mountain Veterinary Branch, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana
5. University of Giessen and Marburg Lung Centre, Justus-Liebig-University of Giessen, Member of the German Centre for Lung Research, Giessen, Germany
6. School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia; and
7. Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, Queensland, Australia