An anaphylactic reaction to highly purified pork insulin. Confirmation by RAST and RAST inhibition

We describe a patient who had an anaphylactic reaction to highly purified pork insulin; he was not allergic however to beef insulin. The sensitivity to pork but not to beef insulin was confirmed by skin testing, radioallergosorbent test (RAST) and RAST inhibition. A scheme is suggested for the investigation of such patients.