Arturo Casadevall, Bloomberg Distinguished Professor and Alfred and Jill Summer Chair of Molecular Microbiology and Immunology at the Johns Hopkins Bloomberg School of Public Health and Johns Hopkins School of Medicine, will give the Microbiology & Immunology Seminar Series virtual presentation, "Thoughts on the Origin of Microbial Virulence," at noon Wednesday, March 29, in Lower Amphitheatre R153 and online via Zoom.