The Florida Department of Health in Monroe County (DOH-Monroe) reported this week on four additional locally acquired dengue fever cases in the Florida Keys. This brings the total cases to 26.

The four people have received medical treatment and are expected to make full recoveries.

Aedes aegypti

Health officials say most of the cases have been reported in the Key Largo area.

DOH-Monroe and the Division of Disease Control and Health Protection are currently conducting epidemiological studies to determine the origin and extent of these infections.

Florida went decades without reported locally-acquired dengue fever until 2009 when an outbreak of dengue was identified in Key West.

Aedes aegypti mosquito

Dengue is a viral infection transmitted by the bite of an infected mosquito. There are four closely related but antigenically different serotypes of the virus that can cause dengue (DEN1, DEN 2, DEN 3, DEN 4).

Dengue Fever (DF) is marked by an onset of sudden high fever, severe headache, pain behind the eyes, and pain in muscles and joints. Some may also have a rash and varying degree of bleeding from various parts of the body (including nose, mouth and gums or skin bruising). Dengue has a wide spectrum of infection outcome (asymptomatic to symptomatic). Symptomatic illness can vary from dengue fever (DF) to the more serious dengue hemorrhagic fever (DHF).