Table 3.
Comprehensive analysis of virulence of M. hyopneumoniae strains following challenge experiments
| Source | Strains | Geographical origins | Virulence | Challenge tests* | References |
|---|---|---|---|---|---|
| International strains | J | Brazil | Low | × | [21] |
| 232 | USA | High | × | [23] | |
| 7448 | Brazil | High | × | [24] | |
| 7422 | Brazil | High | × | [24] | |
| Vaccine strains | RM48 | China | Low | × | – |
| 168 L | China | Low | √ | This study | |
| Field isolates | 168 | China | High | √ | This study |
| NJ | China | High | √ | This study | |
| XLW-2 | China | Low | √ | This study | |
| LH | China | High | √ | This study |
√: Challenge tests shown in this study.
×: Challenge tests not performed in this study.