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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)

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Table 2

Selected characteristics and health outcomes of secondary or primary symptomatic laboratory-confirmed Escherichia coli O157 cases, Scotland, 1999–2008

Characteristic
No. (%) cases, n = 2,026
p value
Secondary cases, n = 246*
Primary cases, n = 1,780*
Case age <10 y 116 (47) 623 (35) <0.0005
Female sex 147 (60) 958 (54) 0.07
Bloody diarrhea† 52 (54)† 608 (66)† 0.02
Hospitalized 82 (33) 816 (46) <0.0005
Illness progressed to hemolytic uremic syndrome 24 (10) 172 (10) 0.95
Sporadic case 158 (64) 1492 (84) <0.0005
Outbreak case 88 (36) 288 (16) <0.0005
Outbreak case, with bloody diarrhea‡ 25 (28)‡ 81 (28)‡ 0.93
Outbreak case, hospitalized‡ 32 (36)‡ 128 (44)‡ 0.22

*Unless otherwise indicated.
†Denominator = 1,022 symptomatic cases reported 2004–2008, all with symptom details available (97 secondary and 925 primary cases).
‡Denominator = 376 outbreak symptomatic cases (88 secondary and 288 primary cases).

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