-How long does immunity from the various childhood vaccines last?*
-Are adults effectively unvaccinated for most "vaccine preventable" illnesses due to their childhood vaccines wearing off?
-Do adults who haven't had booster shots for the childhood vaccines and are effectively unvaccinated present a threat to vaccinated children?
-How is it known that a rise in certain types of antibodies in the blood, caused by vaccine use, causes true immunity to the natural disease it is aimed at? Are there studies to prove this for each of the vaccines used?
-What proportion of the reduction in "vaccine preventable" illness rates over the past century is due to vaccines, and what is due to other factors, such as improved standards of living?
* Is that evidence based on epidemiological studies comparing disease rates among vaccinated and unvaccinated children as they age, or on blood tests looking at changing antibody levels over time?
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