The patch will use microneedles to both administer and monitor its efficacy for the patient by tracking the body’s immune response.

https://www.unilad.co.uk/news/british-scientists-developing-worlds-first-covid-19-vaccine-smart-patch/

Using polycarbonate or silicon millimetre-long microneedles, the smart patch can penetrate the skin to administer the medicine. It can be held in place with a strap or tape for up to 24 hours, during which time it simultaneously measures a patient’s inflammatory response to the jab by monitoring biomarkers in the skin.

Refer to post #258 #259

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