Myositis is a group of conditions that cause muscle inflammation and weakness. Viral myositis occurs as a complication of a viral infection, such as influenza viruses or enteroviruses. Viral myositis, ...

The positive predictive value (PPV) of myositis antibodies for diagnosing myositis and its related conditions differs by individual antibody type. Greater diagnostic accuracy is associated with ...

Previous reports based on individual cases have suggested that myositis can be a side effect of COVID-19 vaccines, although rare. This study of national health registry data in Norway and Sweden found ...