Shark Bites in Florida Are Underreported: A Multi-Dataset Analysis.

IntroductionThere is uncertainty about the number of shark bites on humans in Florida (FL).MethodsThe International Shark Attack File (ISAF) and Global Shark Attack File (GSAF) databases (2016-2024) were compared with the non-inpatient FL Ambulatory and Emergency Department Patient Data database (AHCA) (2018-2023) and the National Emergency Medical Services (EMS) Information System (NEMSIS) (2016-2024).ResultsBetween 2016-2024 there were 244 FL shark encounters reported in ISAF (mean 27.1 per year), 214 in GSAF (mean 23.8 per year), and 293 in a merged ISAF and GSAF (mean 32.6 per year). Between 2020-2023, there were 373 FL shark encounters reported in AHCA (mean 62.2 per year) compared with 114 encounters reported in NEMSIS (mean 22.8 per year) for 2020-2024. The rate ratio for AHCA FL shark encounters compared to the merged ISAF and GSAF was 1.91 (95% CI 1.64-2.23); p < .001. The percentage of shark encounters in Volusia County, FL, compared with all of FL shark encounters showed no significant differences between the ISAF and GSAF (40.2% and 33.6%, respectively) (p = .16) and between the AHCA and NEMSIS (7.2% and 7.5%, respectively) (p = 1.0). However, when comparing either ISAF or GSAF with either AHCA or NEMSIS, there were significant differences (p < .001 for all).DiscussionThe AHCA dataset identified about twice as many shark bites as either the ISAF or GSAF. Many FL shark encounters did not require EMS or admission to the hospital. The discrepancy in the number of shark encounters attributed to Volusia County, FL, varied based on the dataset being examined.