Theresa N Ramos-Summerford1, Scott R Barnum2. 1. Department of Microbiology, University of Alabama at Birmingham, 845 19th Street South, Bevill Biomedical Research Building Room 842, Birmingham, AL 35294, USA. 2. Department of Microbiology, University of Alabama at Birmingham, 845 19th Street South, Bevill Biomedical Research Building Room 842, Birmingham, AL 35294, USA. Electronic address: sbarnum@uab.edu.