Are You Really Allergic to Penicillin? (Update)
Jul 17, 2026 · 1h 5m
Summary
Host Stephen Dubner shares his journey to being "de-labeled" from a false penicillin allergy, revealing that 90% of those who believe they are allergic are not. Allergists Elena Resnick and Kimberly Blumenthal explain the medical dangers and economic costs of this widespread misdiagnosis. The episode also features medical anthropologist Teresa McPhail, who discusses the broader confusion surrounding food and environmental allergies.
Topics discussed
Sponsors and introduction
Host's personal health crisis and penicillin allergy belief
History of penicillin and the prevalence of false allergy labels
Interview with allergist Elena Resnick on immune system and testing
Host's testing process and recovery from thyroiditis
Dr. Kimberly Blumenthal on the medical costs of misdiagnosis
Ozempic advertisement
Sponsors: Southern Company and Advantech
Teresa McPhail on the cultural and economic rise of allergies
The hygiene hypothesis and impact on pregnancy care
Surgical risks and financial savings of delabeling
Sponsors: Figure, Angie, and PNC Bank
Barriers to widespread delabeling and the PAVE Act
Thomas Platts-Mills on research funding and unusual allergy theories
Future of allergy testing and host's gratitude
Listener feedback, new show announcement, and closing sponsors
Listen ad-free on Castria