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What if you step on a rusty nail confirmed tetanus toxoid positive? Do you think these same people will encourage you to get the vaccine? How about rabies?
Flu, not so easy (and an ongoing topic of research)
What's unbelievable? That someone with a graduate degree in engineering who sends their kid to private school has a circle of friends that includes medical doctors and other researchers? Or that there are medical professionals that aren't insufferable authoritarians?