Most of the population has measles titers so low, if exposed they will likely become at least sub-clinically infected and contagious
Measles deaths were down 98% Before the Vaccine Introduced
Vaccinated Can Carry,Spread Pertussis And Made Prone to B. Parapertussis And Published Observations Explicitly Deny Herd Immunity
The evidence suggests smallpox vaccine was not very effective and unimportant in eradication
The evidence vaccines actually stopped diseases is mostly just timing-- which is inherently weak, but for vaccines its terrible.
Link to Diagram Establishing that the preponderance of the evidence indicates the vaccine series is causing serious damage
Outbreak of Measles Among Persons With Prior Evidence of Immunity
A Related Problem is the Vaccine Itself Can Spread Disease
The Definition of Pertussis Was Changed Just When They Released the Vaccine Greatly Narrowing It
Extensive further evidence smallpox vaccination was ineffective
There's Considerable Evidence That Vaccines While Perhaps Eradicating Wild Polio Are Spreading Vaccine Polio Strain Which May Be Worse
While the Purported Saved Lives From Polio And/Or Smallpox May Be Illusory, the Victims of the Vaccines Are Many and Established
'Smallpox and its Eradication' by Fenner et al published by WHO gives several citations to measurements in excess of 94% Vaccine Efficacy
Fenner et al. Consider an Individual to be Unvaccinated Whenever They Find No Vaccination Scar. This is the Purest of Confirmation Bias.
Polio, as defined in 1955, is increasing not going away. The eradication of polio is a redefinition.