Characteristic
|
No. (%) cases, n = 2,228†
|
Range per year, % (p value)
|
| Average reports per year, all cases |
223 |
153–282 |
| Average annual incidence per 100,000 population |
4.4 |
3.0–5.6 |
| Symptomatic cases |
2,026 (91) |
89–94 (0.44) |
| Asymptomatic cases |
202 (9) |
6–11 (0.44) |
| Secondary case‡ |
246 (12)‡ |
4–20 (<0.0005) |
| Primary case‡ |
1,780 (888)‡ |
80–96 (<0.0005) |
| Bloody diarrhea§ |
660 (59)§ |
56–62 (0.80) |
| Hospitalized case-patients |
902 (41) |
29–48 (<0.0005) |
| Hemolytic uremic syndrome |
196 (9) |
6–14 (0.03) |
| Outbreak case |
441 (20) |
13–27 (<0.0005) |
| Sporadic case |
1,787 (80) |
73–87 (<0.005) |
| Sporadic and symptomatic¶ |
1,650 (92) ¶ |
90–95 (0.84) |
| Sporadic, symptomatic, and secondary# |
158 (10)# |
3–15 (<0.005) |
Sporadic, symptomatic, and primary#
|
1,492 (90)#
|
85–97 (<0.005)
|
| *Cases include symptomatic and asymptomatic persons.
†Unless otherwise indicated.
‡Denominator = 2,026 symptomatic cases 1999–2008.
§Denominator = 1,118 cases reported 2004–2008, all with symptom details available (1,022 symptomatic and 96 asymptomatic cases).
¶Denominator = 1,787 sporadic cases.
#Denominator = 1,650 symptomatic sporadic cases. |
