Final answer:
Smallpox is the viral disease that has been eliminated from the general population worldwide due to an effective vaccination campaign by the WHO.
Step-by-step explanation:
The viral disease that has been eliminated from the general population worldwide is smallpox. The worldwide vaccination campaign by the World Health Organization led to the eradication of smallpox in 1979. Humans were the only carriers of the virus, which made it possible to completely remove it from the population. Even though other diseases like polio have been nearly eliminated and are rarely seen in countries like the United States, smallpox remains the only human infectious disease to have been completely eradicated from nature.