title: Three cases of acute myositis in adults following influenza-like illness during the H1N1 pandemic.
abstract: Acute viral myositis is a rare condition that occurs during the recovery phase of an illness, most commonly influenza. It is characterized by muscle pain and weakness with an isolated laboratory finding of elevated serum creatine kinase (CK). We describe three previously healthy patients who were hospitalized after developing myositis following influenza-like illness during the 2009 influenza A (H1N1) virus pandemic. All experienced myalgias and weakness in all four extremities, including distal upper extremities, associated with an elevated CK level that resolved along with their myalgias and weakness within one week with supportive care. These cases serve as a reminder that influenza-related myositis may have atypical characteristics depending on the strain of influenza, and clinicians should be open to this possibility when new outbreaks occur.
authors.affiliation: Department of Neurology, University of Utah School of Medicine, United States of America.
authors.forename: Summer Bell
authors.initials: SB
authors.lastname: Gibson
authors.forename: Jennifer Juhl
authors.initials: JJ
authors.lastname: Majersik
authors.forename: A Gordon
authors.initials: AG
authors.lastname: Smith
authors.forename: Mark B
authors.initials: MB
authors.lastname: Bromberg
keywords: H1N1; influenza; muscle weakness; myositis; viral myositis
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