A case of eastern equine encephalitis has been confirmed in a horse in Michigan, with the state reporting its first case in a Benzie County horse, although a previous case was also reported in Van Buren County, but the year of that case is unclear. The virus, which is spread by mosquitoes, has also been detected in a horse in Florida. Eastern equine encephalitis is reportedly spreading, with cases in multiple states, prompting health alerts and warnings.