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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.
First of all, thank you for taking the time help me understand. I didn't know about past vaccines that used the system.
The smallpox vaccine was put on a sugar lump that children then ate (It really was a different time) And even after going through the digestive tract it still worked.
They didn't use this system. There are other needleless systems, primarily jet systems that use high pressure.