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Logistically speaking, if you think of a rapidly spreading pandemic, having the ability to vaccinate a large number of people is really the only way we know to date how to deal with it. If you need to train emergency personnel, that presents a problem. What if we had a way to vaccinate people by just telling them to stick on a Band-Aid? because the payload can be delivered to areas where it’s needed rapidly— no special handling required— then applied to the skin by someone whose sophistication is limited to that of applying a Band-Aid… it becomes possible to address these major challenges that have long bedeviled the health care profession in delivering vaccines to underserved areas.