Arthropod-borne viruses, also known as arboviruses, include a group of viruses that can be transmitted to humans and horses by infected mosquitoes. The Eastern equine encephalomyelitis (EEE) virus is thought to have been the cause of EEE in North American horses since 1831 but is thought to have been present in its endemic form well before then. The virus was first recognized in humans in 1938. Dr. Maureen Long, an equine veterinarian and virology expert, will discuss why she thinks EEE cases are up in Florida this year and what horse owners can do to minimize the likelihood their animals will become infected.