3 months after people, Every year in the United States oral vaccines were dropped from aircraft in order to help control the spread of rabies. Now, without people to distribute the vaccines, rabies spikes by as much as 30%. The rabies virus causes death by inflaming the brain. Among the victims of the rabies outbreak will be domesticated dogs and cats that managed to escape from their houses.
300 years after people, Animals have now dispersed away from the cities where humans used to live. Because the rabies virus needs dense animal population in order to spread, the dispersal of animals away from cities ends the rabies outbreak.