A veterinary researcher at the University of Missouri expects there to be a decrease in the number of West Nile Virus cases this summer. Gayle Johnson says numbers of cases in horses has dropped in the last few years. Johnson chalks up the lower number for horses on better vaccinations. Despite a lack of a vaccination for people, she admits the number of human cases has gone down as well. But she still cautions Missourians they need to protect themselves and their animals with bug repellants, to stay indoors during dusk – a top time for mosquitoes to be out, and to drain mosquito-breeding areas.