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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.
A machine that produces ultrasonic waves is not that complex. It’s the sensors and qualified technician to read and capture the scans that’s expensive.
Plus have you ever had to physically restrain your child through a needle shot? You said “easiest” and that shit ain’t easy.
You seem to be the only commenter here who recognizes that this would be amazing for pediatric patients - who coincidentally receive way more vaccines than adults.