Yellow fever is an acute viral hemorrhagic, mosquito-borne disease that is endemic in many regions of Africa and South America. Yellow fever can be prevented through vaccination; however, recent vaccine shortages have resulted in alarming outbreaks of the disease in endemic regions. To help control outbreaks, prompt detection of the disease is essential. Regrettably, yellow fever is difficult to diagnose (particularly during the early stages) as the associated symptoms can be confused with malaria, leptospirosis, viral hepatitis (especially fulminant forms), or other hemorrhagic fevers such as dengue hemorrhagic fever. To aid researchers studying yellow fever, BEI Resources now provides Yellow fever virus (YFV) strain SVM 3-18-09 (NR-49799), which is wild-type strain isolated from a monkey (Alouatta sp.) in Maracas, Trinidad in 2009. To view all Yellow fever virus reagents, please click here.