Florida Dengue fever outbreak 2013: Martin County release summary results
Martin County, Florida, on the Sunshine State’s Treasure Coast experienced a locally acquired dengue fever outbreak with onset dates ranging from June to September 2013.
In September of 2013, The Florida Department of Health in Martin County staff conducted a door to door survey in the Rio and Jensen Beach area to learn more about the extent of and factors contributing to an outbreak of dengue fever in that area. More than 300 residents were asked to take part in the survey and provide a blood sample for dengue analysis. Health officials released the results yesterday and here are some of the key findings:
A total of 28 individuals were identified as being infected with dengue virus. 24 symptomatic persons (aged 4-70 years) meeting the national case definition for dengue (21 identified during the outbreak investigation and 3 identified during the serosurvey).
Four asymptomatic individuals were identified during the serosurvey (laboratory tests showed recent dengue infection but no illness was reported). Six of the 24 ill persons were hospitalized.
All cases were found to have been infected with dengue virus 1 (DENV-1). For more infectious disease news and information, visit and “like” the Infectious Disease News Facebook page
82% of the survey participants had heard of dengue. TV and newspapers were the most common sources of knowledge for 59% and 39% of participants, respectively.
Inspections by Martin County Mosquito Control District revealed the following: In August, 33% of inspected locations in the Rio area and 100% of the inspected sites in downtown Jensen Beach had Aedes aegypti mosquito breeding activity.
In September, after intensive mosquito control efforts, 18% of inspected locations in Rio and few to none of the inspected sites in downtown Jensen Beach had signs of Aedes aegypti mosquito breeding activity.
71% of the households participating in the serosurvey had sources of standing water in their yards. Individuals in households with buckets and potted plants in their yard were more likely to be infected with dengue. These common household items serve as a standing water source and potential breeding site for Aedes aegypti mosquitoes.
77% of households indicated that these containers were emptied weekly. Individuals in households that emptied containers of standing water at least once a week were less likely to be infected with dengue.