Anthony Bowen1, Arturo Casadevall2. 1. Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461; 2. Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461; Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205 acasade1@jhu.edu.