1. Research Service Veterans Affairs Nebraska‐Western Iowa Health Care System Omaha Nebraska USA
2. Department of Internal Medicine University of Nebraska Medical Center Omaha Nebraska USA
3. Department of Pharmacology and Experimental Neuroscience University of Nebraska Medical Center Omaha Nebraska USA
4. Department of Environmental Health, Occupational Health and Toxicology University of Nebraska Medical Center Omaha Nebraska USA
5. Institute of Virology Helmholtz Zentrum München Munich Germany
6. German Centre for Infection Research (DZIF) Munich, Hamburg, Heidelberg Germany