Volume 16, Number 4—April 2010
Research
Phylogenetic Analysis of Enterohemorrhagic Escherichia coli O157, Germany, 1987–2008
Christian Jenke, Dag Harmsen, Thomas Weniger, Jörg Rothgänger, Eija Hyytiä-Trees, Martina Bielaszewska, Helge Karch, and Alexander Mellmann
Table 2
MLVA cluster profile of enterohemorrhagic Escherichia coli O157, Germany, 1987–2008*
| MLVA cluster | Cluster-defining MLVA profile | No. strains (% sorbitol-fermenting) | No. MLVA profiles | Years of strain isolation |
|---|---|---|---|---|
| 1 | 4/8/-2/2/3/9/-2/5 | 61 (100) | 16 | 1988, 1989, 1993, 1995–2008 |
| 2 | 7/7/13/4/5/7/-2/7 | 11 (0) | 7 | 1996–1998, 2000, 2002, 2005, 2006 |
| 3 | 11/8/10/3/5/6/8/3 | 9 (0) | 8 | 2001, 2004, 2005, 2007, 2008 |
| 4 | 18/7/8/3/5/7/-2/7 | 8 (0) | 8 | 1996–1999, 2001, 2005, 2006 |
| 5 | 5/7/13/5/6/6/6/6 | 7 (0) | 5 | 1991, 1999, 2007 |
| 6 | 12/7/16/3/5/6/5/7 | 5 (0) | 5 | 1990, 1992, 1999, 2001, 2004 |
| 7 | 18/7/10/4/4/9/4/9 | 5 (0) | 4 | 1996, 1998, 2001–2003 |
| 8 | 9/7/9/4/6/7/9/8 | 3 (0) | 3 | 2007, 2008 |
| 9 | 13/7/11/4/4/8/4/8 | 3 (0) | 3 | 1992, 1993, 2002 |
| 10 | 6/6/16/3/6/6/6/6 | 3 (0) | 3 | 2005, 2006 |
| 11 | 11/9/10/5/7/6/11/7 | 3 (0) | 3 | 1996, 2000, 2007 |
| 12 | 8/10/13/6/7/7/5/6 | 3 (0) | 2 | 2002 |
| 13 | 9/7/13/3/6/6/10/7 | 3 (0) | 2 | 1997, 2002 |
| 14 | NA | 2 (0) | 2 | 2000 |
| 15 | NA | 2 (0) | 2 | 1998, 2000 |
| 16 | NA | 2 (0) | 2 | 1991 |
| 17 | NA | 2 (0) | 2 | 1995, 1997 |
| 18 | NA | 2 (0) | 2 | 1998, 2000 |
| 19 | NA | 2 (0) | 2 | 2001, 2003 |
| Singletons | – | 66 (0) | 60 | All years except 1990, 1995, and 2004 |
*MLVA, multilocus variable number tandem repeat analysis; NA, not applicable because cluster comprises <3 strains. Singletons, MLVA profiles that are not included in a certain cluster. MLVA profiles are defined by repeat numbers after the following variable number tandem repeat (VNTR) locus order: 3/34/9/25/17/19/36/37 with EDL933 as standard with the following MLVA profile: 9/10/11/5/6/6/8/7 (based on genome sequence analysis). Strains belonged to 1 cluster if they differed at <2 VNTR loci.
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