title: Case of mumps orchitis after vaccination.
abstract: We present a case of mumps orchitis after vaccination. A 35-year-old man visited the emergency unit of our hospital for fever and right testicular pain on 7 January 2012. Two weeks before the visit, he underwent vaccination for mumps. After 7 days of hospitalization, the patient recovered from fever and testicular pain. Scrotal magnetic resonance imaging suggested right orchitis, and an increased level of serum mumps immunoglobulin M and immunoglobulin G indicated an initial infection of mumps virus. The peak value of immunoglobulin G showed 106 enzyme immunoassay unit 5 weeks after vaccination, which was 10-fold higher than the ordinary rise of a vaccinated individual. This fact leads to two possibilities. One is this happened as an adverse event of vaccination, and the other is that he actually had a wild-type infection at the same time as vaccination. There are some reports regarding adverse events of mumps vaccine; however, they might include wild-type infection.
authors.affiliation: Department of Urology, Nihon University School of Medicine, Tokyo, Japan.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Kanda
authors.forename: Junichi
authors.initials: J
authors.lastname: Mochida
authors.forename: Shogo
authors.initials: S
authors.lastname: Takada
authors.forename: Yutaro
authors.initials: Y
authors.lastname: Hori
authors.forename: Kenya
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Satoru
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000328:Adult; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009107:Mumps / Q000209:etiology* / Q000473:pathology; D009108:Mumps Vaccine / Q000009:adverse effects*; D009920:Orchitis / Q000209:etiology* / Q000473:pathology
chemical_list: D009108:Mumps Vaccine
keywords: mumps; post-vaccine orchitis; vaccination