Examining the Threat of H5N1 Highly Pathogenic Avian Influenza to Human Health
Bibliographic record
Abstract
TOPIC IMPORTANCE: The clade 2.3.4.4b highly pathogenic avian influenza (HPAI) virus H5N1 is the etiologic agent for an ongoing panzootic with a rapidly increasing number of human infections. Although morbidity and mortality in humans with this clade seems to be limited to date, previous HPAI H5N1 viruses have been associated with mortality rates of approximately 50% in humans. Not all cases of clade 2.3.4.4b influenza A(H5N1) HPAI in humans have been associated with known exposure to infected animals. Therefore, clinicians must be aware of the changing viral ecology, human risk factors, and clinical presentations associated with H5N1 viruses to facilitate early case recognition and management of clade 2.3.4.4b A(H5N1) HPAI infection in humans. REVIEW FINDINGS: Historic H5N1 presentations have involved multiorgan systemic disease, notably including severe neurological disease. Common symptoms associated with clade 2.3.4.4b A(H5N1) HPAI include conjunctivitis, fever, and upper respiratory tract infection. Exposure to infected dairy cattle is a novel risk factor. SUMMARY: The rapid global spread of clade 2.3.4.4b A(H5N1) viruses has been associated with severe disease and high mortality in many farmed animal species and wildlife. The composite picture of emerging risk to human health comprises an unprecedented number of mammalian infections, viral adaptations to mammalian hosts, severe neuroinvasive disease in naturally infected mammals, and spillover into novel species such as dairy cows with forward transmission to humans. Preparedness measures are crucial to mitigating significant human health impacts from this virus and must include a Canadian One Health Training Program in Emerging Zoonoses approach that promotes both animal and human health.
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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 | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.001 |
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".