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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.
Just source it yourself, it's over the counter in the UK and unlikely to be difficult elsewhere. Apply thirty mins beforehand with the patch over, make sure you put it where the injection will go of course... remove when ready, wipe the cream away and voila, no feeling. The dentist uses a spray anaesthetic before needles; despite my phobia, I don't really mind gum injections, very weird.