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Table 1 Summary of swimmer’s Itch survey reports and cases over five years

From: Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future

Month May June July August September    
Year Reports Cases Reports Cases Reports Cases Reports Cases Reports Cases Total Reports Additional Cases Total Cases
2013 NA NA 19 NA 101 NA 149 NA 25 NA 295 NA 295
2014 0 0 1 2[1] 64 242[13] 75 281[51] 6 14[2] 144 388 532
2015 3 6[2] 78 283[12] 144 540[15] 102 355[17] 18 48[5] 347 892 1239
2016 7 18[6] 49 169[20] 128 442[12] 56 176[11] 6 31[10] 248 596 844
2017 1 3[3] 16 26[7] 152 432[14] 99 185[12] 13 22[4] 280 665 945
Average 2.75 9 32.6 120 117.8 414 96.2 249.25 13.6 28.75 262.8 635.25 771
Difference 6.25 87.4 296.2 153.05 15.15 508.2
  1. Reports are individual survey events, while cases are the addition of reports and the additional number of people affected with swimmer’s itch at the same time as the person reporting. Brackets after the number of cases represents the maximum number of cases per report at that time