Vincent visits the Australian Animal Health Laboratory in Geelong, Australia and speaks with Linfa about his work on bats and bat viruses.
Vincent, Dickson, Alan and Rich discuss an estimate of the number of different mammalian viruses on Earth.
Vincent, Dick, Alan and Rich revisit a vaccinia virus lab accident and viral vaccines produced in plants, then talk about an iPhone app to track infectious diseases, flying foxes, and an inhaled measles vaccine.