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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 1

Temporal clusters of human listeriosis identified by ribotyping, pulsed-field gel electrophoresis (PFGE), or both by using a 3-month window, New York State, November 1996–June 2000a

p values for temporal scan statistic with:
Cluster
Ribotype
Ribotype
PFGE type
Date of specimen collection
AscI PFGE type (no.)
PFGE relatedness
A
DUP-1044A
NS
<0.05
Sep 1997
NY1997ASC0016
Indistinguishable




Sep 1997
NY1997ASC0016
Indistinguishable
B
DUP-1044Aa
<0.01
<0.05
Sep 1998
NY1997ASC0006
1 band from NY1997ASC0010




Oct 1998
NY1997ASC0010 (7)
Indistinguishable




Nov 1998
NY1997ASC0010 (2)
Indistinguishable




Dec 1998
NY1997ASC0010 (4)
Indistinguishable
C
DUP-1042B
<0.05
N/A
Dec 1998
NY1999ASC0045
>5 bands from all others in cluster




Feb 1999
NY1997ASC0017
2 bands from NY1997ASC0014




Feb 1999
NY1996ASC0001
>5 bands from all others in cluster




Feb 1999
NY1999ASC0050
>5 bands from all others in cluster




Mar 1999
NY1997ASC0014
2 bands from NY1997ASC0017
D
DUP-1042B
NS
<0.05
Aug 1999
NY1997ASC0017
>5 bands from all others in cluster




Aug 1999
NY1999ASC0050
2 bands from NY1999ASC0061




Aug 1999
NY1999ASC0061
Indistinguishable




Sep 1999
NY1999ASC0061
Indistinguishable
E
116-363-S-2
<0.01
<0.01
Aug 1999
NY1999ASC0052
Indistinguishable

116-363-S-2
<0.01
<0.01
Sep 1999
NY1999ASC0052
Indistinguishable

DUP-1044B
NS
<0.01
Sep 1999
NY1999ASC0052
Indistinguishable

116-363-S-2
<0.01
NS
Sep 1999
NY1999ASC0064
4 bands from NY1999ASC0052
F
DUP-1053A
<0.05
<0.05
Sep 1999
NY1999ASC0069
Indistinguishable




Nov 1999
NY1999ASC0069 (2)
Indistinguishable




Dec 1999
NY1999ASC0069
Indistinguishable
G
DUP-1052Aa
NS
<0.05
Oct 1999
NY1997ASC0018 (3)
Indistinguishable
H
DUP-1043
<0.01
<0.05
Jan 2000
NY2000ASC0075
Indistinguishable




Feb 2000
NY2000ASC0075
Indistinguishable
I
DUP-1045B
<0.05
<0.05
Apr 2000
NY2000ASC0077
Indistinguishable




May 2000
NY2000ASC0077
Indistinguishable
May 2000 NY2000ASC0083 >5 bands from NY2000ASC0077

aEpidemiologically linked clusters; cluster B linked to eating hot-dog brand 1, cluster G to eating paté brand 2; bold, isolates for which PFGE patterns were supportive of respective clusters; NS, not significant (p>0.05); N/A, the statistical significance of occurrence of a unique PFGE type cannot be tested.

Main Article

Page created: December 22, 2010
Page updated: December 22, 2010
Page reviewed: December 22, 2010
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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