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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.
I don't think any amount of de-specializing would be enough to trust the ignorant and/or malicious masses could or would self-administer adequately.
You're right. Can't just post them to folks and expect 100% uptake. It might widen the possibilities of more people getting more vaccines, though. In my books, this can only be a good thing.