What do we know about viral arthritis?

The onset of acute polyarticular arthritis often signals the presence of viral arthritis, which stands as the most prevalent manifestation. Parvovirus, alphaviruses, hepatitis B and C, Epstein-Barr virus, and various tropical viruses are frequently identified as the culprits. Despite viruses being responsible for a minority of acute arthritis cases, distinguishing virally-induced arthritis from primary rheumatological conditions holds significant clinical importance, shaping subsequent treatment strategies. According to the NCBI StatPearls publication, the mechanisms underlying viral arthritis remain largely elusive in the majority of patients. Viruses can trigger joint symptoms through diverse pathways, including direct joint invasion, the formation of immune complexes, and immune modulation leading to persistent inflammation. Identifying viral arthritis relies primarily on clinical assessment, supplemented by ancillary investigations such as inflammatory marker analysis, autoantibody testing, and serological assays. Suspicion of a viral origin arises when a patient presents with sudden-onset arthralgia or polyarticular symptoms, particularly if symptom duration is less than six weeks. Additional attention should be paid to the presence of extra-articular manifestations, such as rash or lymphadenopathy.