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Observed frequency of appearance of CO2-independent mutants in different Brucella strains.
| Strain | Frequency of mutants |
| Brucella abortus 292 | 2.72 × 10–8 |
| B. abortus 544 | 5.95 × 10–8 |
| B. abortus 86/8/59 | 1.14 × 10–9 |
| B. abortus A-579 | 2.29 × 10–10 |
| Brucella ovis 63/290 | 3.38 × 10–6 |
| Brucella pinnipedialis B2/94 | 5.5 × 10–6 |
