In the history of mankind we have managed to eradicate a grand total of one human virus, Smallpox, and it took about 150 years of vaccinations to do it. We almost managed to eradicate Polio after only 75 years of vaccinations, but it keeps popping up in Afghanistan. Since Brandon abandoned Afghanistan to the Taliban, it is not likely that Polio will be eradicated anytime soon.
Viruses don’t get eradicated.
Polio was re-defined overnight to reduce it by 75%.
Most virus mortality rates fell by 90% or more before the respective vaccines were even introduced. Why? Public sanitation, clean water, and improved nutrition. Nutrition can still eradicate illness from viruses. None other than the WHO recommends a mega dose of Vitamin A for measles in poor countries. Scarlet fever fell like all the other “vaccine-preventable” diseases with no vaccine. Typhoid IIRC fell similarly with minimal vaccination.