 Desiree LeBeau is a global health researcher at Stanford University. She's been studying vector-borne illnesses for about 20 years. So I call myself an arbovirologist, which is a person who studies these arboviruses, which are arthropod-borne viruses. West Nile is our most important arbovirus in this country. We are getting a vocabulary workout in this story. West Nile is just one of the diseases carried by these insects, and LeBeau says a hotter planet lengthens the breeding season.