Drs. Derek Chu and David McCullagh chat with us about the approach to a patient with documented penicillin allergy and the importance of exploring this label in detail. We cover risk stratification, allergy testing and an approach to test dosing. As always, we post an associated infographic at www.theinternatwork.comGuest Fellows: Dr. David McCullagh (Infectious Diseases Fellow, McMaster University) and Dr. Derek Chu (Allergy and Immunology Fellow, McMaster University) Hosts: Zahra Merali and Laiya Carayannopoulos