Volume 17, Number 3—March 2011
Dispatch
Escherichia coli O157 Infection and Secondary Spread, Scotland, 1999–2008
Table 1
Selected characteristics and health outcomes of laboratory-confirmed Escherichia coli O157 cases, Scotland, 1999–2008*
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. |