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Volume 17, Number 3—March 2011

Dispatch

Escherichia coli O157 Infection and Secondary Spread, Scotland, 1999–2008

Mary E. LockingComments to Author , Kevin G.J. Pollock, Lesley J. Allison, Linda Rae, Mary F. Hanson, and John M. Cowden
Author affiliations: Author affiliations: Health Protection Scotland, Glasgow, Scotland (M.E. Locking, K.G.J. Pollock, L. Rae, J.M. Cowden); Scottish E. coli O157/VTEC Reference Laboratory, Edinburgh, Scotland (L.J. Allison, M.F. Hanson)

Main Article

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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