Table 4. Bayesian-adjusted survey-weighted true prevalence, by herd and season, of Salmonella sp. shed in feces of 240 culled cows sampled on six California dairies (PCR positive or inconclusive and culture positive of enriched broth of fecal samples).
| Dairy | Prevalence, % (95% CI) | Serogroup | Serotype | ||||
|---|---|---|---|---|---|---|---|
| Summera | Fall | Winter | Spring | All Seasons | |||
| 1 | 0.0 (-) | 0.0 (-) | 0.0 (-) | 0.0 (-) | 0.53 (0.01, 2.78) | S. sp. untypeable | |
| 2 | 0.0 (-) | 0.0 (-) | 0.0 (-) | 0.0 (-) | 1.05 (0.03, 5.47) | C1 | S. Mbandaka |
| 3 | 0.0 (-) | 8.97 (7.77, 9.91) | 19.4 (18.1, 20.6) | 0.0 (-) | 11.1 (5.97, 18.2) | B | S. Typhimurium |
| C1 | S. Montevideo | ||||||
| 4 | 61.2 (59.2, 63.6) | 71.7 (69.5, 74.3) | 50.8 (48.9, 52.8) | 29.9 (28.4, 31.4) | 57.0 (49.8, 64.1) | C1 | S. Montevideo |
| C2 | S. Bardo | ||||||
| 5 | 0.0 (-) | 8.97 (7.77, 9.91) | 8.97 (7.77, 9.91) | 0.0 (-) | 6.27 (1.71, 14.5) | B | S. Typhimurium |
| C1 | S. Rissen | ||||||
| D | |||||||
| 6 | 8.97 (7.77, 9.91) | 0.0 (-) | 82.2 (79.7, 85.0) | 92.6 (89.9, 95.8) | 67.3 (57.6, 76.1) | C1 | S. Montevideo |
| S. Cerro | |||||||
| All | 20.7 (19.4, 21.9) | 35.2 (33.6, 36.8) | 29.7 (28.2, 31.2) | 23.9 (22.5, 25.2) | 29.4 (28.4, 30.5) | ||
Notes.
a
Study year and seasons included summer (July 1–September 30, 2015), fall (October 1–December 31, 2015), winter (January 1–March 31, 2016) and spring (April 1–June 30, 2016).