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Volume 1, Number 1—January 1995

Dispatch

An Outbreak of Shigella sonnei Infection Associated with Consumption of Iceberg Lettuce

J.A. Frost, M.B. McEvoy*, C.A. Bentley, Y. Andersson**, and B. Rowe
Author affiliations: Laboratory of Enteric Pathogens, Central Public Health Laboratory, London, England; *Communicable Disease Surveillance Centre, London, England; **Swedish Institute for Infectious Diseases Control, Stockholm, Sweden

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Table 2

Sh. sonnei case control study Single variable matched analysis

Case (n=27)
Control (n=44)
Did not Did not No. of
Food Ate eat % ate Ate eat % ate sets p-value
Prawns 4 22 15 7 37 15 (26s) 0.9388
Shrimps 0 27 0 1 43 2 (27s) 0.3070
Steak 7 19 27 6 37 14 (26s) 0.0139
Burgers 5 22 19 12 32 27 (27s) 0.2045
Salad 25 2 93 34 10 77 (27s) 0.0081
Cold meats 15 10 60 29 13 69 (23s) 0.7708
Tomatoes 22 4 85 33 11 75 (26s) 0.1039
Spring onions 5 21 19 9 35 21 (26s) 0.7556
Celery 5 22 19 5 39 11 (27s) 0.2956
Cucumber 16 11 59 31 13 71 (27s) 0.3798
Other salads 16 10 62 26 18 59 (26s) 1.0000
Lettuce 25 2 93 31 13 71 (27s) 0.0007
Cos lettuce 2 20 9 3 25 11 (17s) 1.0000
Webb's lettuce 5 18 22 4 34 11 (21s) 0.2632
Lamb's lettuce 2 17 11 6 36 14 (19s) 0.1002
Raddicio lettuce 4 20 17 7 34 17 (23s) 0.8720
Iceberg lettuce 17 8 68 19 23 45 (25s) 0.0023
Frisee lettuce 5 18 22 4 37 10 (22s) 0.2582
Home 15 8 65 27 16 63 (23s) 0.8494
Restaurant 6 16 27 5 33 13 (21s) 0.1546
Pub 4 18 18 2 34 6 (20s) 0.0795
Other outlet 10 14 42 7 31 18 (22s) 0.0012

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