Penicillin allergy affects more than 25 million people in the United States (up to 1 in 10 Americans) and has been shown to lead to particularly poor health outcomes in pregnant women and surgical patients. It is also a public health threat, leading to antibiotic resistance and infections in hospitalized patients that can be life threatening. Seventy-five% or more penicillin allergy labels come on by age 3 due to, for example, confusion with a viral rash. The majority of these rashes were never allergic, but the labels 'stick' into adulthood and carry many adverse consequences.

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