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.