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Vaccination is widely credited to Edward Jenner; the familiar tale of using fluid from a milkmaid’s cowpox blister to induce a boy’s immunity against smallpox marked the onset of an era of undeniable success against childhood enemies such as polio, diphtheria, pertussis, and measles. This resounding public health success has in some ways contributed to paradoxical complacency about vaccine-preventable diseases and vaccine hesitancy, as many young parents have no historical memory of the diseases that were real dangers to previous generations.
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