About the Author Karen C. Carroll, MD (Baltimore, MD) Professor of Pathology, The Johns Hopkins University School of Medicine; Director, Division Medical Microbiology, The Johns Hopkins Hospital. Janet Butel PhD (Houston, TX) is affiliated with Baylor University College of Medicine. Timothy Mietzner PhD (Pittsburgh, PA) Associate Professor, Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine. Read more
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