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Inclusion and exclusion criteria used for literature screening in this study.
| Inclusion | Exclusion |
|---|---|
| Study conducted in China | Study conducted elsewhere |
| Study dairy cows or humans | Study other hosts |
| Clearly defined study year and province | Unclear study time and place |
| Tested for Brucella abortus using explicit tests | Study not investigating Brucella abortus |
| Original observational studies | Review and clinical reports |
| Full text available | Full text unavailable |
