I've never been "vaccinated" with the poisons my entire adult life and won't ever choose to do such a thing.
Plus I'm the healthiest person I know, never in my life gotten sick from an imaginary virus and that won't in the future.
Also, I do live alone. If I did get sick, then it would probably be from something I ate, so I'd get it out of my system and be fine, the same as I've done in the past.
There'd be no reason for me to go to the doctor purveyors of death so they could tie me down, paralyze me with their toxic biocide petroleum drugs, ram a tube down my throat, lock me in a private room while starving and killing me by shooting more of their poisonous biocides into my body. NO. One of my missions in life is to stay far, far away from terrible people like them who would so such things to living breathing well functioning human beings.
So my point is that willingly having poisons into your body is NOT going to make anyone any healthier nor to protect them from anything - but it IS much more likely to make you sick on a long term basis and even to kill you quite rapidly.
So why do it? There's no good reason at all.