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Volume 16, Number 11—November 2010
Research

Salmonella enterica Pulsed-Field Gel Electrophoresis Clusters, Minnesota, USA, 2001–2007

Joshua M. RoundsComments to Author , Craig W. Hedberg, Stephanie Meyer, David J. Boxrud, and Kirk E. Smith
Author affiliations: Minnesota Department of Health, St. Paul, Minnesota, USA (J.M. Rounds, S. Meyer, D.J. Boxrud, K.E. Smith); University of Minnesota School of Public Health, Minneapolis, Minnesota, USA (C.W. Hedberg)

Main Article

Table 2

Univariate association between Salmonella enterica serovar frequency, cluster size, cluster density, and cluster being solved, Minnesota, USA, 2001–2007*

Characteristic No. (%) solved clusters No. unsolved clusters Odds ratio (95% confidence interval)
Serovar
Very common† 22 (10) 203 Referent
Common‡ 11 (23) 37 2.74 (1.23–6.13)
Uncommon§ 10 (14) 61 1.51 (0.68–3.37)
Total
43 (13)
301

Cluster size¶
2 16 (8) 194 Referent
3 8 (15) 47 2.06 (0.83–5.11)
4 7 (24) 22 3.86# (1.43–10.40)
>5 12 (24) 38 3.83 (1.68–8.74)
Total
43 (13)
301

Cluster density, d**
0 5 (71) 2 25.8 (3.42–195.37)
1–7 16 (33) 33 5.01 (1.33–18.89)
8–14 11 (22) 40 2.84 (0.73–11.07)
>15 3 (9) 31 Referent
Total 35 (25) 106

*A solved cluster is one that results in identification of a confirmed outbreak.
S. enterica serovars Typhimurium and Enteritidis.
S. enterica serovars Newport, Heidelberg, and Montevideo.
§All other serovars.
¶Significant Mantel-Haenszel χ2 test result for trend (p<0.001).
#Clusters of 4 cases compared with clusters of 3 cases odds ratio 1.87, 95% confidence interval 0.52–6.66.
**Cluster density measured as the number of days from receipt of first cluster case to third case received at the Minnesota Department of Health Public Health Laboratory.

Main Article

Page created: March 04, 2011
Page updated: March 04, 2011
Page reviewed: March 04, 2011
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