How does Venezuelan equine encephalitis (VEE) differ from Western equine encephalitis (WEE)?

Venezuelan equine encephalitis (VEE) is known for being more severe than Western equine encephalitis (WEE) and is primarily found in central and South America, rather than the USA. The statement that VEE is much more severe than WEE reflects the potential for widespread outbreaks and severe clinical manifestations in affected horses and, in some cases, humans. While both diseases are caused by different strains of alphaviruses, VEE typically presents a greater risk and severity in its impact on equine populations compared to WEE, which tends to be milder overall. Moreover, while VEE is occasionally documented in humans, it is not endemic in the USA, further highlighting its geographical distinction from WEE. Thus, the correct understanding of the differences between these viruses includes recognizing the severity and geographical distribution, which supports the chosen answer.