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Volume 16, Number 11—November 2010

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 3

Comparison of Salmonella enterica cluster investigation thresholds, Minnesota, USA, 2001–2007*

Cluster investigation threshold No. isolates represented in clusters All Salmonella isolates, % 
(n = 3,803†) Estimated interview time, h/y‡ No. (%) outbreak clusters meeting threshold Cluster investigation PPV
All clusters (n = 344) 1,182 31 76 43 (100) 13
Clusters >3 cases (n = 152) 778 20 50 35 (81) 23
Clusters >4 cases (n = 83) 601 16 39 23 (53) 28
Clusters with a density of 0–14 d§ (n = 119) 633 17 41 32 (74) 27
Clusters >4 cases or with a density of 0–7 d§ 
(n = 100) 652 17 42 28 (65) 28

*PPV, positive predictive value.
†A total of 215 isolates associated with excluded clusters were removed from study isolate total (n = 4,018).
‡Based on a 27-min median interview time per case-patient.
§Density defined as the number of days from receipt of first cluster case isolate to third case isolate 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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