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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 agree! Auto injectors aren't cheap compared to ye olde trusty ampule and syringe, and this might push the costs towards the higher end again. I can see a kids-and-the-latex-allergic edge case scenario.
Can't wait to see what develops 😄