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†
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.
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