Volume 17, Number 3—March 2011
Dispatch
Escherichia coli O157 Infection and Secondary Spread, Scotland, 1999–2008
Mary E. Locking
, Kevin G.J. Pollock, Lesley J. Allison, Linda Rae, Mary F. Hanson, and John M. Cowden
, Kevin G.J. Pollock, Lesley J. Allison, Linda Rae, Mary F. Hanson, and John M. Cowden
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. | ||
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