TABLE 3.
Persistence of PFGE types in individual animals that were positive for E. coli 0157 on two or more occasions and from which a PFGE result was available
| Farm | Animal | PFGE type isolated at the following time (mo/yr)a:
|
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 08/99 to 11/99 | 04/00 | 05/00 | 06/00 | 07/00 | 08/00 | 09/00 | 10/00 | 11/00 | 12/00 | 01/01 | 02/01 | ||
| Farm 2 | A133 | NS | NS | NS | NS | NS | − | NS | − | X44 | X44 | NS | NS |
| A151 | NS | NS | NS | NS | NS | − | NS | − | − | − | NS | ||
| A156 | NS | NS | NS | NS | NS | − | NS | − | X39 | X39 | X39 | X39 | |
| A162 | NS | NS | NS | NS | NS | − | NS | − | − | X39 | X39 | − | |
| A166 | NS | NS | NS | NS | NS | − | NS | − | − | X39 | X39 | NS | |
| A179 | NS | NS | NS | NS | NS | NS | NS | − | − | X44 | X44 | − | |
| A196 | NS | NS | NS | NS | NS | NS | NS | − | − | X44 | X45 | − | |
| A206 | NS | NS | NS | NS | NS | NS | NS | NS | − | − | |||
| A207 | NS | NS | NS | NS | NS | NS | NS | NS | − | X44 | X44 | ||
| A208 | NS | NS | NS | NS | NS | NS | NS | NS | − | − | |||
| A210 | NS | NS | NS | NS | NS | NS | NS | NS | − | X44 | X45 | ||
| A212 | NS | NS | NS | NS | NS | NS | NS | NS | X44 | X44 | − | ||
| A215 | NS | NS | NS | NS | NS | NS | NS | NS | − | X44 | X44 | ||
| A217 | NS | NS | NS | NS | NS | NS | NS | NS | − | X44 | − | X45 | |
| A219 | NS | NS | NS | NS | NS | NS | NS | NS | − | X44 | X44 | ||
| A225 | NS | NS | NS | NS | NS | NS | NS | NS | − | − | |||
| A230 | NS | NS | NS | NS | NS | NS | NS | NS | − | X39 | X39 | − | |
| A247 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | X39 | X39 | |
| A259 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | X44 | X45 | |
| A260 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | X44 | X45 | |
| A265 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | X44 | X44 | |
| A268 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | X44 | X44 | |
| Farm 3 | A4 | NS | NS | NS | − | NS | NS | NS | NS | NS | |||
| A10 | NS | NS | NS | − | − | NS | NS | NS | NS | NS | |||
| A13 | X24 | NS | − | X24 | NS | NS | NS | NS | NS | NS | NS | NS | |
| A17 | X24 | NS | X24 | X24 | NS | − | − | NS | NS | NS | NS | NS | |
| A19 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | |||
| A21 | NS | NS | X24 | X24 | NS | NS | NS | NS | NS | NS | NS | NS | |
| A26 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | |||
| A28 | NS | NS | X24 | − | − | − | X24 | NS | NS | NS | NS | NS | |
| A32 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | |||
| A35 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | |||
| A36 | NS | NS | X24 | X24 | NS | NS | NS | NS | NS | NS | NS | NS | |
| A40 | NS | − | − | − | − | NS | NS | NS | NS | NS | |||
| A45 | NS | − | − | − | NS | NS | NS | NS | NS | NS | |||
| A53 | NS | − | − | − | NS | NS | NS | NS | NS | NS | |||
| A55 | NS | − | − | − | − | NS | NS | NS | NS | NS | |||
| Farm 4 | A2 | NS | NS | − | − | − | X52 | − | X52 | NS | − | − | |
| A5 | NS | NS | − | − | − | X49 | − | − | X49 | NS | − | − | |
| A6 | NS | NS | − | − | X54 | − | X54 | − | NS | − | − | ||
| A8 | NS | NS | − | − | − | − | − | − | NS | ||||
| A18 | NS | NS | − | NS | − | − | X49 | X49 | − | NS | − | ||
| A21 | NS | NS | − | − | − | − | X49 | − | − | NS | X49 | − | |
| A79 | NS | NS | NS | NS | NS | NS | NS | NS | X46 | NS | − | X46 | |
| A82 | NS | NS | NS | NS | NS | NS | NS | NS | NS | ||||
| A92 | NS | NS | NS | NS | NS | NS | NS | NS | − | NS | X46 | X47 | |
| Farm 5 | A19 | NS | NS | − | − | X56 | NS | X56 | − | NS | NS | NS | NS |
| A41 | NS | NS | X31 | X31 | − | NS | NS | NS | NS | NS | NS | NS | |
| A43 | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS | |||
| Farm 8 | A17 | NS | X8 | X8 | − | X8 | NS | NS | NS | NS | NS | NS | NS |
| A22 | NS | X8 | X11 | X8 | − | NS | NS | NS | NS | NS | NS | NS | |
| A23 | NS | − | X8 | − | X8 | NS | NS | NS | NS | NS | NS | NS | |
| A24 | NS | X8 | X8 | X8 | − | NS | NS | NS | NS | NS | NS | NS | |
| A48 | NS | X30 | X30 | − | NS | NS | NS | NS | NS | NS | NS | NS | |
| A56 | NS | X30 | X30 | X30 | X30 | NS | NS | NS | NS | NS | NS | NS | |
| A78 | NS | − | − | X30 | X30 | NS | NS | NS | NS | NS | NS | NS | |
| A93 | NS | NS | − | X8 | − | X8 | NS | NS | NS | NS | NS | NS | |
| A102 | NS | NS | NS | X8 | − | − | X8 | − | NS | NS | NS | NS | |
| A104 | NS | NS | NS | − | − | NS | NS | NS | NS | NS | |||
| A138 | NS | NS | NS | NS | NS | − | X30 | X30 | NS | NS | NS | NS | |
| A193 | NS | NS | NS | NS | NS | NS | NS | NS | X25 | − | X25 | NS | |
| Farm 9 | A3 | NS | − | − | − | − | − | − | − | − | NS | ||
| A7 | − | − | − | − | − | − | − | − | − | NS | |||
| A9 | NS | − | − | − | − | X24 | X24 | X24 | X24 | − | − | NS | |
| A16 | NS | − | − | − | − | − | NS | NS | NS | NS | |||
| A29 | NS | − | − | − | X24 | X24 | − | X24 | − | NS | NS | NS | |
| A31 | NS | − | − | − | X24 | − | − | − | X24 | X24 | − | NS | |
| A47 | − | − | − | − | − | − | − | − | − | − | |||
| A53 | − | − | − | − | − | − | − | − | − | − | |||
| A56 | NS | − | − | − | X27 | X27 | X27 | − | − | − | − | − | |
| A59 | − | − | − | X24 | X24 | − | − | − | − | − | − | ||
| A74 | NS | − | − | − | − | X24 | X24 | − | − | − | − | − | |
| A77 | NS | − | − | − | − | − | − | − | − | − | |||
| A81 | NS | − | − | − | X26 | X26 | − | − | − | − | |||
| A82 | NS | − | − | − | − | X25 | X26 | − | − | − | − | ||
| A92 | NS | NS | − | − | − | − | − | − | − | − | |||
| A93 | NS | NS | − | − | − | − | X24 | − | − | X24 | − | − | |
| Farm 10 | A39 | NS | NS | NS | − | − | − | NS | − | − | NS | X24 | X24 |
| Farm 11 | A5 | NS | NS | NS | − | NS | − | − | − | − | X8 | X8 | |
| A13 | NS | NS | − | NS | − | − | − | − | − | − | |||
a
−, the sample from the animal was negative for E. coli O157. NS, the animal was not sampled on that occasion. Empty cells indicate that the sample from the animal was positive for E. coli O157, but the isolates showed fingerprints that were never found again in isolates from the same animal.