Table 2.
Criteria used to define persistence of Listeria monocytogenes in literature.
| Persistence Definition | Time Frame | Sample Number | Persisters Identified | Reference |
|---|---|---|---|---|
| PFGE type detected repeatedly for longer than 6 months | 1 year | |||
| 319 | ST9, ST121 | [64] | ||
| PFGE type isolated at least 3 occasions over the 16-month sampling period | 16 months | 2496 | LS1, LS2, LS4, LS5, LS7, LS25, LS35, LS45 | [65] |
| Genotypes isolated at least on 3 occasions with a minimum interval of 6 months between first and last isolation | 3 years | 1702 | Serogroup IIa | [66] |
| PFGE type isolated at least six months apart | 3 years | 5869 | P59, P6, P10, P32, P44 | [67] |
| PFGE type isolated repeatedly, at least 4 times | 2 years | 1801 | 26 pulsotypes | [68] |
| CTs isolated at least 3 times with a minimum of 1 year between the first and last isolation | 4 years | 100 | CT1526, CT1828, CT1833, CT1834, CT1836, CT1839 | [69] |