The Florida Department of Health has confirmed that a horse in Hillsborough County was infected with eastern equine encephalitis.
The horse was most likely infected in mid-July and has been euthanized.
Hillsborough County has been under an advisory for mosquito-borne illnesses since March 25. The last human case of locally acquired EEE in Hillsborough County occurred that month.
EEE is a rare disease caused by a mosquito-transmitted virus that can cause inflammation of the brain. Only about 5 cases of EEE in humans are reported each year. It cannot be passed from person to person.
Health Department officials advise residents and visitors to avoid mosquito bites and stop mosquitoes from living and multiplying around their homes or businesses by taking simple steps like draining any standing water.