This commentary provides a clinical review of a missed diagnosis of Epstein-Barr virus infection that was identified via autopsy and summarizes contributing factors to the incident with an emphasis on the role of cognitive bias. The piece includes the perspectives of the patient's family and from the organization regarding what happened and what could have been done to prevent this outcome. This discussion is the first in a series of diagnostic error case presentations to be published in this journal.

This commentary illustrates how misdiagnosis of food allergies can delay correct diagnosis and treatment.