Table 3. MLVA results of the 110 toxigenic C. difficile isolates analyzed by year.
| Number of isolate in different year | ||||||||
| Toxin type | MLVA groupa | Isolate no. (%) | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 |
| A+B+ | 70 | 2 | 5 | 4 | 3 | 21 | 35 | |
| 1 | 12 (17%) | 1 | 1 | 4 | 6 | |||
| 2 | 8 (11%) | 1 | 1 | 2 | 4 | |||
| 3 | 7 (10%) | 1 | 1 | 3 | 2 | |||
| 4 | 6 | 1 | 2 | 3 | ||||
| 5 | 5 | 1 | 1 | 3 | ||||
| 6 | 5 | 1 | 1 | 3 | ||||
| 7 | 4 | 1 | 3 | |||||
| 8 | 3 | 1 | 1 | 1 | ||||
| 9 | 3 | 1 | 2 | |||||
| 10 | 2 | 2 | ||||||
| 11 | 2 | 1 | 1 | |||||
| 12 | 2 | 1 | 1 | |||||
| 13 | 2 | 2 | ||||||
| 14 | 1 | 1 | ||||||
| 15 | 1 | 1 | ||||||
| 16 | 1 | 1 | ||||||
| 17 | 1 | 1 | ||||||
| 18 | 1 | 1 | ||||||
| 19 | 1 | 1 | ||||||
| 20 | 1 | 1 | ||||||
| 21 | 1 | 1 | ||||||
| 22 | 1 | 1 | ||||||
| A − B+ | 40 | 0 | 7 | 11 | 3 | 8 | 11 | |
| 1 | 24 (60%) | 3 | 8 | 1 | 4 | 8 | ||
| 2 | 5 (13%) | 1 | 1 | 1 | 2 | |||
| 3 | 4 (10%) | 1 | 2 | 1 | ||||
| 4 | 1 | 1 | ||||||
| 5 | 1 | 1 | ||||||
| 6 | 1 | 1 | ||||||
| 7 | 1 | 1 | ||||||
| 8 | 1 | 1 | ||||||
| 9 | 1 | 1 | ||||||
| 10 | 1 | 1 | ||||||
MLVA: multilocus variable-number tandem-repeat analysis.
a
C. difficile isolates with similarity ≥85% were considered to be a MLVA group.