1Department of Pediatrics, University of Minnesota Medical School, Minneapolis
2Division of Microbiology and Department of Microbial Pathogenesis and Vaccine Research, Helmholtz Centre for Infection Research, Braunschweig, Germany
3Department of Microbial Pathogenesis and Vaccine Research, Helmholtz Centre for Infection Research, Braunschweig, Germany
Reprints or correspondence: Dr. Edward L. Kaplan, Dept. of Pediatrics, MMC 296, 420 Delaware St. SE, Minneapolis, MN 55455 ([email protected]).