Karen A Kormuth1, Seema S Lakdawala2,3. 1. Biology Department, Bethany College, Bethany, WV, USA. 2. Department of Microbiology & Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. Lakdawala@pitt.edu. 3. Center for Vaccine Research, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. Lakdawala@pitt.edu.