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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 had a friend who would have severe reactions to injections. He wasn't afraid of needles, but his body would have weird reactions lasting about a week after having an injection. It was really problematic, so he tried to avoid them whenever possible. All this to say, I bet he'd be excited if something like this were made available to him.
Had a class mate in elementary school that literally ram screeming when we were getting out hepititis shots. This would be great for someone's like that who is very much afraid of needles
That's me.
Keloid formation?