Examines the common strategies viruses employ to infect diverse hosts as well as the unique characteristics of viral pathogenesis in the human host. Topics will include the origin and nature of viruses, how viruses are classified, the molecular events in the infection and replication of viruses in eukaryotic cells, how viruses cause disease in humans, the host response to virus infection, and the spread and control of viruses infecting humans. Prions and other subviral agents will also be discussed. This is an elective course for Biology and Health Sciences majors. Prerequisites: BIOLOGY 242 (Microbiology) and BIOLOGY 271 (Cell Biology). Three hours lecture and discussion per week. Not offered every semester.