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Volume 19, Number 1—January 2013

CME ACTIVITY

Listeriosis Outbreaks and Associated Food Vehicles, United States, 1998–2008

Emily J. Cartwright, Kelly A. Jackson, Shacara D. Johnson, Lewis M. Graves, Benjamin J. SilkComments to Author , and Barbara E. Mahon
Author affiliations: Author affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

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Table 2

Characteristics of 24 listeriosis outbreaks by implicated food categories, Foodborne Disease Outbreak Surveillance System, United States, 1998–2008*

Food category No. outbreaks Total no. cases† No. (%) hospitalized No. deaths (CFR, %) Age group, y, no. (%)‡
No. (%) female‡
<1 1–49 >50
Deli meats 6 132 49 (37) 15 (11) NA NA NA 40 (45)
Frankfurters 3 116 101 (87) 14 (12) 0 52 (46) 60 (54) 57 (49)
Other meats 2 14 3 (21) 0 NA NA NA 2 (67)
Mexican-style cheese 4 45 41 (91) 1 (2) 8 (18) 32 (73) 4 (9) 37 (84)
Other dairy products 2 8 7 (88) 4 (50) 1 (13) 1 (13) 6 (75) 4 (50)
Salad/other 3 27 7 (26) 3 (11) 0 7 (26) 20 (74) 16 (59)
Unknown 4 17 7 (41) 1 (6) 0 1 (13) 7 (88) 4 (50)
Overall 24 359 215 (60) 38 (11) 10 (4) 120 (50) 108 (45) 160 (54)

*CFR, case-fatality rate; NA, not available.
†Includes laboratory-confirmed and epidemiologically linked cases.
‡Percentages were calculated on the basis of available information on age distribution (17 outbreaks) and sex (19 outbreaks) for 238 and 296 patients, respectively.

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