In this podcast, Dr. David McCullagh and Dr. Derek Chu discuss penicillin allergy: its prevalence, how to diagnose it, and how to confirm patient-reported penicillin allergy.Dr. David McCullagh is an infectious disease fellow at McMaster University and Dr. Derek Chu, fifth-year allergy and immunology resident, also at McMaster University in Hamilton, Ontario.They co-authored a peer-reviewed practice article published in the Canadian Medical Association Journal. It is titled "Five things to know about...Penicillin allergy."Full practice article (subscription required): www.cmaj.ca/lookup/doi/10.1503/cmaj.181117----------------------------------------------------------------------This podcast episode is brought to you by Audi Canada.The Canadian Medical Association has partnered with Audi Canada to offer CMA members a preferred incentive on select vehicle models. Purchase any new qualifying Audi model and receive an additional cash incentive based on the purchase type. Details of the incentive program can be found at www.audiprofessional.ca.-----------------------------------Subscribe to CMAJ Podcasts on Apple Podcasts, iTunes, Google Play, Stitcher, Overcast, Instacast, or your favourite aggregator. You can also follow us directly on our SoundCloud page or you can visit www.cmaj.ca/page/multimedia/podcasts.