For the years 2013 and 2014, the most recent years for which preliminary data could be analyzed, public health officials from 29 states reported 86 recreational water–associated outbreaks, which resulted in at least 2,202 cases, 119 hospitalizations, and four deaths. Among the 67 outbreaks caused by infectious pathogens, 30 (45%) were caused by Cryptosporidium, 17 (25%) by Legionella, and nine (13%) by norovirus.
Additionally, CDC analyzed Foodborne Diseases Active Surveillance Network (FoodNet) population survey data to characterize bathers and estimate magnitude of recreational water exposure because published data are limited. An estimated 37.9% (95% confidence interval [CI]: 36.9–38.9) of the FoodNet population had recreational water exposure, 24.9% (95% CI:
24.0, 25.8) in swimming pools. Exposure occurred year round and peaked in the summer.
Exposure was highest among those ages 5–11 years, followed by those 12–17 and 2–4 years; an estimated 88.5% (95% CI: 87.4–89.7) of FoodNet bathers were white. We estimated 17,420,983 (95% CI: 16,841,899–18,000,067) persons in the FoodNet population had recreational water exposure totaling 155,230,515 days over the course of 1 year. Come to this presentation to learn about 1) when and where the U.S. recreational water–associated outbreaks occurred and CDC resources to prevent and control the outbreaks and 2) how days are spent swimming in, wading in, or entering recreational water in the United States annually.