What Is SLEV Virus?
What Is SLEV Virus? Saint Louis encephalitis virus (SLEV) is a Flavivirus that is transmitted to humans by the bite of an infected mosquito. Other viruses that belong to the genus Flavivirus include West Nile, Zika and dengue. The virus is cycled from mosquitoes, to birds, and back to mosquitoes. What is St Louis disease?