TABLE 1.
Bacterial strains and vaccines
| Strain | Relevant genotype | Vaccine or challenge inoculum (CFU/animal) | Source or reference |
|---|---|---|---|
| χ3246 | Wild type, parent strain | 1.9 × 109 | 23 |
| χ3781 | Δcya Δ(crp-cdt) vpl+ | 1.6 × 109 | 23 |
| χ3923 | Δcya Δ(crp-cdt) vpl− | 2.2 × 109 | 23 |
| χ4186 | Δcya Δcrp vpl+ | 2.8 × 109 | 23 |
| χ4497 | Δcya Δcrp vpl− | 4.7 × 109 | This study |
| χ4522 | Δcya Δ(crp-cdt) pmi-3834 vpl+ | 2.0 × 109 | This study |
| χ4814 | Δcya Δcrp pmi-3834 vpl+ | 3.6 × 109 | This study |
| SC-54 | vpl−; unknown attenuation | Not determineda | 40 |
| P92-091 | Ampr | 8.9 × 108 | This study |
| UC6077 | This study |
a
Vaccine administered as per manufacturer’s recommendation.