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Volume 9, Number 6—June 2003
Research

Molecular Subtyping to Detect Human Listeriosis Clusters

Brian D. Sauders*†, Esther D. Fortes†, Dale L. Morse*‡, Nellie Dumas*, Julia A. Kiehlbauch*, Ynte Schukken†, Jonathan R. Hibbs*, and Martin Wiedmann†Comments to Author 
Author affiliations: *Wadsworth Center, New York State Department of Health, Albany, New York, USA; †Cornell University, Ithaca, New York, USA; ‡University at Albany, Albany, New York, USA

Main Article

Table 2

Comparison of statistically significant temporal listeriosis clusters stratified by subtyping technique used to detect and confirm each cluster

Clusters Cluster definition No. of clusters No. of cases (%)a
1. Clusters detected by ribotype or PFGE
Ribotype clusters or PFGE clusters detected by using the scan statistic (p<0.05)
9
41 (31)
2. Ribotype clusters
Indistinguishable ribotype pattern clusters detected by the scan statistic (p<0.05)
6
31 (24)
2a. Ribotype clusters supported by PFGE
Ribotype clusters, containing closely related PFGE types (<3 bands difference)
6
26 (20)
3. PFGE clusters
Indistinguishable PFGE patterns detected by the scan statistic (p<0.05)
8
31 (24)
3a. PFGE clusters supported by ribotype
PFGE clusters, which contained identical ribotype patterns
8
30 (23)
4. Clusters supported by ribotype and PFGE
Clusters detected as 2a and 3a
5
23 (18)
5. Epidemiologically linked ribotype or PFGE clusters Clusters detected by ribotype, PFGE, or both and supported by epidemiologic data 2 17 (13)

aBased on total sample population of 131 isolates; PFGE, pulsed-field gel electrophoresis.

Main Article

Page created: December 22, 2010
Page updated: December 22, 2010
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