Changes in the rates of field isolation and antimicrobial susceptibility of bacterial pathogens collected from fall-placed feedlot steers between arrival at the feedlot and 90 to 120 days on feed
Bibliographic record
Abstract
The change in bacterial recovery and phenotypic antimicrobial susceptibility of 3 important bovine respiratory disease bacteria (Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni) between arrival and 90 to 120 days was observed in 295 healthy fall-placed feedlot calves in western Canada using deep nasal swabs. At the arrival sampling, 28%, 28%, and 9% of calves were culture positive for Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni, respectively; these rates changed to 23%, 14%, and 16%, respectively, in the post-arrival period. A decrease in antimicrobial susceptibility was observed between the arrival and post-arrival sample periods, with numerically fewer pan-susceptible isolates and little change in multi-drug resistant isolates. Between the 2 sampling periods, statistically significant decreases in susceptibility to tilmicosin and tulathromycin were observed for Mannheimia haemolytica and tildipirosin for Pasteurella multocida isolates. Results of this study suggest that changes to both the proportions of bacteria isolated and the antimicrobial susceptibility of isolates occur between arrival and ~90 days post-arrival.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".