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| Test | Negative | % | Positive | % | Total |
| Direct examination | 196 | 26.30 | 549 | 73.69 | 745 |
| Conventional culture | 102 | 13.69 | 643 | 86.30 | 745 |
| Serology (IDD)* | 67 | 11.07 | 502 | 88.22 | 569 |
*: IDD was available from 1975.
