When the animal-rights activists release the rage-infected monkey, it immediately attacks and infects the female activist, thus starting the spread of the Rage virus in the human population.
One of the animal-rights activists assaulting a researcher at the Cambridge Primate Research Center. The scientist says, "You don't understand! The chimps are infected!"
More news footage, but now the audience can see that the footage is prerecorded and being shown on loop. The newsreel is being shown to the chimps as part of the research center's Rage experiment.