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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.

Many low-risk patients with a penicillin allergy were able to have their penicillin allergy label removed through a simple procedure known as “direct oral challenge” as part of a world-first multicenter randomized control trial known as the Penicillin Allergy Clinical Decision Rule (PALACE) study.