The European Journal of Case Reports in Internal Medicine is an official Journal of the European Federation of Internal Medicine (EFIM), representing 36 national societies from 34 European countries. The Journal's mission is to promote the best medical practice and innovation in the field of acute and general medicine. It also provides a forum for internal medicine doctors where they can share new approaches with the aim of improving diagnostic and clinical skills in this field.

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Mohamad El Labban, Stevan Oluic, Hussein Guleid, Mohamed Hassan, Rawan Diab, Mohamad Ali Rida

Introduction: Polymyalgia rheumatica (PMR) is a chronic inflammatory disorder that causes stiffness and pain in the proximal joints, including the shoulders, hips and neck. The exact cause of polymyalgia rheumatica is yet to be fully understood, but research suggests that both genetic and environmental factors may contribute to it. Studies have previously linked the onset and relapse of polymyalgia rheumatica symptoms to the influenza and COVID-19 vaccines. The Food and Drug Administration approved the respiratory syncytial virus (RSV) vaccine, which is a recombinant protein vaccine for adults over 60, in May 2023. No previous reports of polymyalgia rheumatica onset or relapse have been linked to the RSV vaccine. The human proteome shares some peptides with the RSV F antigen, suggesting a high risk of cross-reactivity when using that antigen in vaccination formulations.
Case description: A 72-year-old man experienced a new onset of bilateral shoulder pain and stiffness three days after receiving the Abrysvo® RSV vaccine. The symptoms lasted more than an hour (up until noon) and interfered with his activities of daily living. Inflammatory markers such as C-reactive protein were elevated. The patient’s symptoms and inflammatory marker levels significantly improved with prednisone therapy.
Conclusion: In patients with typical PMR symptoms, it is important for clinicians to carefully review immunisation history to rule out any potentially related adverse effects.

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2024: Vol 11 No 7