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Volume 20, Number 4—April 2014

Research

Large Outbreak of Cryptosporidium hominis Infection Transmitted through the Public Water Supply, Sweden

Micael WiderströmComments to Author , Caroline Schönning, Mikael Lilja, Marianne Lebbad, Thomas Ljung, Görel Allestam, Martin Ferm, Britta Björkholm, Anette Hansen, Jari Hiltula, Jonas Långmark, Margareta Löfdahl, Maria Omberg, Christina Reuterwall, Eva Samuelsson, Katarina Widgren, Anders Wallensten, and Johan Lindh
Author affiliations: Umeå University, Umeå, Sweden (M. Widerström, M. Lilja, M. Ferm C. Reuterwall, E. Samuelsson); Jämtland County Council, Östersund, Sweden (M. Widerström, M. Omberg); Public Health Agency of Sweden, Soina, Sweden (C. Schönning, M. Lebbad, G. Allestam, B. Björkholm, A. Hansen, J. Långmark, M. Löfdahl, K. Widgren, A. Wallensten, J. Lindh); Mid Sweden University, Östersund, (T. Ljung,); Östersund Municipality, Östersund (J. Hitula); and Karolinska Institutet, Stockholm (J. Lindh)

Main Article

Table 2

Clinical characteristics of surveyed case-patients and non–case-patients in Cryptosporidium infection outbreak, Östersund, Sweden, 2010-2011

Symptom No. positive answers/total no. respondents (%)*
All respondents, N = 972† Case-patients, n = 434 Non-case-patients, n = 538
Diarrhea, >3 stools/d 382/967 (39.5) 382/429 (89.0) 0/538 (0)
Watery diarrhea 343/945 (36.3) 343/407 (84.3) 0/538 (0)
Abdominal cramps 382/952 (40.1) 328/416 (78.8) 54/536 (10.1)
Fatigue 342/921 (37.1) 302/413 (73.1) 40/508 (7.9)
Nausea 301/931 (32.3) 253/396 (63.9) 48/535 (9.0)
Headache 267/920 (29.0) 232/406 (57.1) 35/514 (6.8)
Fever >38.0°C 128/909 (14.1) 121/393 (30.8) 7/516 (1.4)
Muscle or joint aches 95/875 (10.9) 80/366 (21.9) 15/509 (2.9)
Vomiting 89/894 (10.0) 76/357 (21.3) 13/537 (2.4)
Eye pain 81/877 (9.2) 67/367 (18.3) 14/510 (2.7)
Bloody diarrhea 16/883 (1.8) 15/345 (4.3) 1/538 (0.2)

*Respondents who answered yes (case-patients) compared with those who answered no (non–case-patients) about whether they had experienced >3 episodes of diarrhea daily and/or watery diarrhea with onset after November 1, 2010.
†Results on the basis of answers from 972 of 1,044 respondents.

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