TABLE 3.
Annual distributions of L. monocytogenes PFGE types
| No. of isolates | Sero- type | PFGE type | Groupa | No. of isolates in the following yr:
|
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 (n = 18) | 1991 (n = 17) | 1992 (n = 16) | 1993 (n = 16) | 1994 (n = 25) | 1995 (n = 20) | 1996 (n = 21) | 1997 (n = 47) | 1998 (n = 43) | 1999 (n = 45) | 2000 (n = 19) | 2001 (n = 27) | ||||
| 37 | 1/2a | 1 | G1 | 2 | 5 | 4 | 7 | 3 | 11 | 2 | 3 | ||||
| 20 | 1/2a | 23 | G1 | 1 | 3 | 3 | 3 | 6b | 1 | 3 | |||||
| 6 | 1/2a | 240 | G1 | 3 | 3 | ||||||||||
| 5 | 1/2a | 200 | G1 | 3 | 1 | 1 | |||||||||
| 1 | 1/2a | 58 | G1 | 1 | |||||||||||
| 1 | 1/2a | 215 | G1 | 1 | |||||||||||
| 1 | 1/2a | 251 | G1 | 1 | |||||||||||
| 8 | 1/2a | 2 | G2 | 1 | 4 | 2 | 1 | ||||||||
| 4 | 1/2a | 42 | G2 | 3 | 1 | ||||||||||
| 27 | 1/2a | 5 | GT5 | 1 | 2 | 2 | 1 | 8 | 9 | 4b | |||||
| 7 | 1/2a | 96 | G96 | 1 | 1 | 1 | 1 | 1 | 2 | ||||||
| 1 | 1/2a | 62 | G96 | 1 | |||||||||||
| 1 | 1/2a | 71 | G71 | 1 | |||||||||||
| 4 | 1/2a | 225 | 1 | 1 | 2 | ||||||||||
| 2 | 1/2a | 33 | 1 | 1 | |||||||||||
| 2 | 1/2a | 53 | 1 | 1 | |||||||||||
| 2 | 1/2a | 63 | 1 | 1 | |||||||||||
| 2 | 1/2a | 75 | 1 | 1 | |||||||||||
| 2 | 1/2a | 207 | 1 | 1 | |||||||||||
| 2 | 1/2a | 237 | 2 | ||||||||||||
| 2 | 1/2a | 248 | 2b | ||||||||||||
| 28 | 1/2a | STc | 2 | 4 | 1 | 1 | 2 | 1 | 1 | 3 | 1 | 5 | 2 | 5 | |
| 6 | 1/2b | 74 | G74 | 2 | 2 | 2 | |||||||||
| 2 | 1/2b | 234 | G74 | 2b | |||||||||||
| 3 | 1/2b | 217 | 1 | 1 | 1 | ||||||||||
| 1 | 1/2b | 224 | G74 | 1 | |||||||||||
| 6 | 1/2b | STd | 1 | 1 | 1 | 1 | 2 | ||||||||
| 9 | 1/2c | 24 | GT24 | 1 | 3 | 1 | 1 | 1 | 2 | ||||||
| 1 | 1/2c | 235 | 1 | ||||||||||||
| 32 | 3a | 71 | G71 | 3e | 19e | 10e | |||||||||
| 1 | 3a | 244 | G71 | 1 | |||||||||||
| 1 | 3a | 2 | G2 | 1 | |||||||||||
| 1 | 3a | 207 | 1 | ||||||||||||
| 1 | 3a | 231 | 1 | ||||||||||||
| 15 | 4b | 11 | G11 | 4b | 1 | 1 | 4 | 1 | 1 | 3 | |||||
| 10 | 4b | 68 | G11 | 4 | 1 | 3 | 1 | 1 | |||||||
| 7 | 4b | 7 | G11 | 1 | 1 | 2 | 3 | ||||||||
| 7 | 4b | 21 | G21 | 1 | 2b | 1 | 1 | 1 | 1 | ||||||
| 4 | 4b | 69 | G21 | 3 | 1 | ||||||||||
| 4 | 4b | 72 | G21 | 1 | 3 | ||||||||||
| 4 | 4b | 201 | G21 | 1 | 2 | 1 | |||||||||
| 3 | 4b | 56 | G21 | 1 | 2 | ||||||||||
| 3 | 4b | 67 | G21 | 1 | 1 | 1 | |||||||||
| 3 | 4b | 70 | G21 | 1 | 1 | 1 | |||||||||
| 1 | 4b | 214 | G21 | 1 | |||||||||||
| 9 | 4b | 61 | G61 | 1 | 1 | 1 | 5 | 1 | |||||||
| 3 | 4b | 10 | G61 | 3 | |||||||||||
| 1 | 4b | 206 | G61 | 1 | |||||||||||
| 5 | 4b | 65 | GT65 | 1 | 1 | 3b | |||||||||
| 4 | 4b | 84 | 1 | 1 | 2 | ||||||||||
| 1 | 4b | 211 | 1 | ||||||||||||
| 1 | 4b | 212 | 1 | ||||||||||||
a
A “G” prefix indicates genetically closely related strains of several PFGE types; a “GT” prefix indicates at least five identical strains not related to other strains.
b
Including a mother-child pair; both were counted.
c
Each strain is connected with a single PFGE type, including PFGE types 14, 27, 44, 57, 59, 66, 73, 78, 202, 205, 208, 209, 210, 216, 218, 220, 227, 228, 229, 230, 233, 241, 243, 245, 246, 247, 249, and 250.
d
Each strain is connected with a single PFGE type, including PFGE types 64, 213, 226, 236, 239, and 242.
e
At least 25 of 32 isolates (78%) were connected with an outbreak (26).