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Volume 9, Number 6—June 2003

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

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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)
41 (31)
2. Ribotype clusters
Indistinguishable ribotype pattern clusters detected by the scan statistic (p<0.05)
31 (24)
2a. Ribotype clusters supported by PFGE
Ribotype clusters, containing closely related PFGE types (<3 bands difference)
26 (20)
3. PFGE clusters
Indistinguishable PFGE patterns detected by the scan statistic (p<0.05)
31 (24)
3a. PFGE clusters supported by ribotype
PFGE clusters, which contained identical ribotype patterns
30 (23)
4. Clusters supported by ribotype and PFGE
Clusters detected as 2a and 3a
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.

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