title: A case of myositis of the deltoid muscle of the upper arm developing 1 week after influenza vaccination: case report.
abstract: We report a case of an elderly man who developed myositis of the deltoid muscle 8 days after influenza vaccination. Adverse reactions to influenza vaccine are generally immediate reactions. However, delayed-type hypersensitivity reactions, although rare, can occur after routine influenza vaccination.
authors.affiliation: Department of Internal Medicine, Kinan Public Hospital Mie, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Urayoshi
authors.affiliation: Department of Gastroenterology, Saitama Medical Center, Jichi Medical University Saitama, Japan.
authors.forename: Satohiro
authors.initials: S
authors.lastname: Matsumoto
authors.affiliation: Department of Gastroenterology, Saitama Medical Center, Jichi Medical University Saitama, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Miyatani
authors.affiliation: Department of Gastroenterology, Saitama Medical Center, Jichi Medical University Saitama, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yoshida
keywords: Adverse reactions; delayed-type hypersensitivity reactions; influenza vaccine; myositis
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