Engineers spent a long time finding components that are safe for the body, stable and capable of lasting for several years.
This is then applied to the skin via a microneedle patch rather than a traditional syringe and needle. By selectively loading microparticles into the microneedles, the patches deliver a pattern in the skin: a cross for example, or a circle, which will show up on the screen of a smartphone that has its infrared filter removed, indicating a patient’s vaccine status.
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