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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 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.

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