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Ultrasound can push vaccines into the body without needles
(www.newscientist.com)
This is a most excellent place for technology news and articles.
Someone being a vegan doesn't exactly put other people at risk.
Where does other peoples' freedom start? Do you also have the freedom to burn toxic materials in your backyard, where your neighbours can inhale the smoke? Because proper disposal of toxic waste is much more similar to getting vaccinated than your metaphor.