West Nile Virus Chorioretinopathy
West Nile Virus (WNV) infection may cause serious complications such as meningoencephalitis and optic neuritis. The disease prevalence was limited to some areas in Asia, Africa, and the Middle East. However, since the past decade, an increasing number of cases of WNV infection have been reported in nonendemic areas such as the United States. WNV-associated chorioretinitis usually involves both eyes and is frequently associated with mild or moderate vitreous inflammation. Chorioretinal involvement is usually multifocal in distribution. In this chapter, ocular and neurological findings of WNV infection are discussed and illustrated.