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Table 3 Estimated annual number of cases of mild and moderate illness (C90) due to water recreation, by activity, in millions a

From: Estimate of incidence and cost of recreational waterborne illness on United States surface waters

Activity AGI Respiratory Eye Ear Skin
Swimming 29.14
(23.09–34.58)
9.22
(1.29–16.66)
--b 6.87
(2.62–10.25)
12.06
(6.99–16.87)
Kayaking 0.54
(0.11–0.97)
--b 0.63
(0.04–1.29)
--b --b
Rowing 0.38
(0.03–0.76)
--b 0.42
(0.03–0.85)
--b --b
Canoeing 0.78
(0.15–1.38)
--b 0.91
(0.05–1.84)
--b --b
Motor boating 4.77
(0.94–8.50)
--b 5.59
(0.36–11.31)
--b --b
Fishing 15.27
(4.12–25.12)
--b --b --b --b
Total 50.95
(36.59–63.42)
9.22
(1.29–16.66)
7.55
(0.49–15.28)
6.87
(2.62–10.25)
12.06
(6.99–16.87)
Moderate Severityc 7.2% 13.7% 10.4% 24.3% 5.4%
  1. a Calculated based on estimated number of water recreation events and the attributable risk of illness, may not sum to estimated totals due to rounding
  2. b No excess illnesses expected, based on the attributable risk
  3. c Percent with moderate severity illness (those who contact their HCP or go to an ED)