If the ownership of slaves is what you associate with Jefferson, that is proof that the establishment media is controlling your mind, preventing you from understanding basic economics so the public can remain enslaved without realizing it. Slavery long ago is not an excuse to ignore slavery now. But the establishment wants you focused on the past, not the land under your feet that enslaves the masses today.
It has taken a lot of scientists a lot of time to come up with something the human body did automatically. I am a lot more impressed with our innate immune systems than with vaccinations. There are times when it is a good idea to get vaccinated against things, but everyone needs to decide for themselves when that is.