I was a member of the national test group for Salk polio vaccine at my elementary school in about the fifth or sixth grade.
They never told the parents who had the real vaccine and who had the placebo. However, the results were so obvious that they curtailed the test and began full scale dispensation over the entire USA.
Since they never said who had the real vaccine, everyone in my class had to be vaccinated again. That time they gave us the Sabin vaccine on a suger cube.
Matthew 6:34 (KJV)
Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.