The pathogenicity and virulence of Sindbis virus.

Sindbis virus (SINV), a widely distributed alphavirus, is both a foundational model for viral replication studies and an underrecognized human pathogen. Despite its typically mild presentation, SINV can lead to prolonged joint pain and, in rare cases, neurological complications. This review explores SINV's molecular biology and clinical manifestations, particularly its role in causing Sindbis Fever - a self-limiting but potentially chronic arthritic disease. Molecular insights reveal mechanisms of immune evasion, neurovirulence, and persistent infection, highlighting SINV's potential for broader public health impact, especially under changing climatic conditions. This review also identifies key virulence determinants and discusses the virus's utility as a model for studying alphaviral encephalitis. Continued research is essential to better understand SINV pathogenesis and to prepare for potential outbreaks.