To the Editor.—I recently examined a boy who was found to have unilateral nerve deafness on a routine screening examination at school. An evaluation at a speech and hearing center disclosed a unilateral nerve deafness. The cause was not clear. This case was particularly interesting because one year previously, I had examined the boy for his school physical and an audiogram at that time disclosed normal hearing in both ears. He had no history of having had mumps, so mumps vaccine (Mumpsvax, Jeryl Lynn strain) was administered. He had no reaction to this and was completely well between the time of his school physical and time that his audiogram showed hearing loss.
Since mumps virus is known to cause unilateral nerve deafness, I thought that the association in this case was worthy of note.