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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

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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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