Microneedle Flu Vaccine: A Novel Method for Pain-Free Flu Shots Microneedle vaccines utilize tiny microneedles, usually made of metals or polymers, to deliver vaccine through the skin. These microneedles are so small that they cannot penetrate deep enough to reach nerves, eliminating the pain typically associated with traditional hypodermic needle injections. The shallow penetration is enough to stimulate an immune response in the skin's rich network of...
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