1. Department of Microbiology, The University of Iowa, Iowa City, IA 52242, USA
2. Stead Family Department of Pediatrics, The University of Iowa, Iowa City, IA 52242, USA
3. Pappajohn Biomedical Institute and the Center for Gene Therapy for Cystic Fibrosis, The University of Iowa, Iowa City, IA 52242, USA
4. Department of Molecular Medicine, The University of Iowa, Iowa City, IA 52242, USA
5. Department of Internal Medicine, The University of Iowa, Iowa City, IA 52242, USA
6. Department of Pathology, The University of Iowa, Iowa City, IA 52242, USA