Kevin Messacar1,2, Mark J Abzug2, Samuel R Dominguez2,3. 1. Department of Pediatrics, Section of Hospital Medicine, Children's Hospital Colorado and University of Colorado School of Medicine, Aurora, Colorado. 2. Department of Pediatrics, Section of Infectious Diseases, Children's Hospital Colorado and University of Colorado School of Medicine, Aurora, Colorado. 3. Department of Pathology and Laboratory Medicine, Children's Hospital Colorado and University of Colorado School of Medicine, Aurora, Colorado.