Final answer:
Measles, mumps, and polio are three viral diseases that can potentially be eradicated through mass immunization, with polio being the virus closest to eradication following the successful eradication of smallpox.
Step-by-step explanation:
Three important viral diseases that are targeted to be potentially eradicated by mass active immunization include measles and mumps, with the third being polio. Unlike influenza, polio is a disease that has nearly been eradicated thanks to global vaccination efforts. Tuberculosis, although not caused by a virus but rather a bacterium, and hepatitis, specifically hepatitis B, also have vaccinations available, but the eradication of these diseases has not been as successful as smallpox or as promising as the efforts against polio.
It's important to note that while diseases like measles, mumps, and polio have been significantly reduced in countries with high vaccination rates, they are not entirely eliminated worldwide. The success of vaccinations in reducing the prevalence of these diseases demonstrates the power of vaccines and the importance of immunization programs.