Vincent and Alan meet up with Julie and Paul at the General Meeting of the American Society for Microbiology in Boston, to talk about their work on the pathogenesis of poliovirus and measles virus.

Vincent, Alan, and Rich celebrate the 200th episode of TWiV by visiting the National Emerging Infectious Diseases Laboratories at Boston University Medical Center, where they meet with Elke, Paul, and Ron to talk about building and working in a BSL4 facility.