Relationship Between H5N2 Avian Influenza Viruses Isolated from Wild and Domestic Ducks in British Columbia, Canada
Bibliographic record
Abstract
In the summer of 2005 a Canadian national surveillance program for influenza A viruses in wild aquatic birds was initiated. The program involved collaboration between federal and provincial levels of government and was coordinated by the Canadian Cooperative Wildlife Health Centre. The surveillance plan targeted young-of-the-year Mallards along with other duck species at six sampling locations along the major migratory flyways across Canada. Beginning in early August, cloacal swabs were taken from 704 ducks on two lakes adjacent to one another near Kamloops, British Columbia. The swabs were screened for the presence of influenza A RNA using a real-time reverse transcription-polymerase chain reaction (RRT-PCR) assay that targets the M1 gene. Swab samples that gave positive results underwent further testing using H5- and H7-specific RRT-PCR assays. One hundred and seventy-four cloacal swab specimens gave positive or suspicious results for the presence of an H5 virus. A portion of these (28/35) were confirmed using an H5-specific conventional reverse transcription-polymerase chain reaction assay and an H5 virus was eventually isolated from 24/127 swab specimens. Neuraminidase typing revealed the presence of H5N2 and H5N9 viruses. In mid-November of 2005 an H5N2 virus was detected in a commercial duck operation in the lower mainland of British Columbia, approximately 120 km from where the H5N2-positive wild ducks were sampled. Molecular genetic analysis of the H5N2 viruses isolated from wild and domestic ducks was carried out to determine their kinship.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".