Table 3.
Qualitative and quantitative evaluation of ESCr E. coli for cattle injected with ceftiofur during the increased disease susceptibility period
| Period | No. sampled | Fecal samples |
Hide samples |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % ESCr E. coli prevalence (frequency)a | No. of samples in each class of log CFU/swab values |
% ESCr E. coli prevalence (frequency)a | No. of samples in each class of log CFU/100 cm2 values |
|||||||||
| 1.70 to 1.99 | 2.00 to 2.99 | 3.00 to 3.99 | 4.00 to 4.99 | >4.99 | 1.30 to 1.99 | 2.00 to 2.99 | 3.00 to 3.99 | >3.99 | ||||
| Increased disease susceptibility, pre-ceftiofur injection | 49 | 8.2 (4) B | 0 | 4 | 0 | 0 | 0 | 8.2 (4) AB | 2 | 2 | 0 | 0 |
| Increased disease susceptibility, 3 to 8 days post-ceftiofur injection | 50 | 92.0 (46) A | 3 | 19 | 17 | 6 | 1 | 26.0 (13) A | 10 | 1 | 2 | 0 |
| Increased disease susceptibility, additional post-ceftiofur injection samples | 11 | 90.9 (10) | 1 | 3 | 5 | 1 | 0 | 27.3 (3) | 1 | 2 | 0 | 0 |
| December 2009 | 49 | 6.1 (3) B | 1 | 1 | 0 | 1 | 0 | 24.5 (12) A | 7 | 5 | 0 | 0 |
| March 2010 | 48 | 0.0 (0) B | 0 | 0 | 0 | 0 | 0 | 0.0 (0) B | 0 | 0 | 0 | 0 |
| May 2010 | 48 | 2.1 (1) B | 0 | 1 | 0 | 0 | 0 | 20.8 (10) A | 9 | 1 | 0 | 0 |
| July 2010 | 48 | 2.1 (1) B | 1 | 0 | 0 | 0 | 0 | 0.0 (0) B | 0 | 0 | 0 | 0 |
| Total | 303 | 21.5 (65) | 6 | 28 | 22 | 8 | 1 | 13.9 (42) | 29 | 11 | 2 | 0 |
a
Prevalence values in the same column that do not have a common letter are statistically significantly different (P < 0.05). Prevalences for increased disease susceptibility with additional post-ceftiofur injection samples were not included in statistical comparisons.