1. Department of Medical Microbiology and Immunology, University of Wisconsin—Madison, Madison, Wisconsin, USA
2. Translational Imaging Center, University of Southern California, Los Angeles, California, USA
3. Department of Microbiology, University of Iowa, Iowa City, Iowa, USA
4. Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina, USA
5. Iowa Inflammation Program, University of Iowa, Coralville, Iowa, USA
6. Veterans’ Administration Medical Center, Iowa City, Iowa, USA