A Demonstration of Leukergy—A Form of Leukocyte Aggregation—in Hen Blood Samples
Bibliographic record
Abstract
Background and Objective: Leukocyte aggregation of blood is used to diagnose infectious and inflammatory disease in humans and mammals, but not yet in avians. This study describes aggregations of avian blood leukocytes demonstrating a behavior known as “leukergy.” It was detected in blood smears from a large study (N ~300) of commercial hens (LSL) housed in aviaries (AV) conventional cages (CC) and enriched cages (EN). Methodology: Three samples at 32 wk and 3 at 56 wk were selected to illustrate the leukergy phenomenon. Aggregates, defined as clusters containing a minimum of 3 contiguous cells, were found by light microscopy of Wright-Giemsa stained blood films. Results: The leukergy aggregates containing cells of the same series, called a homogeneous type, or a mixed series, called a heterogeneous type. The number of cells in an aggregate ranged from as few as 3 (minimum required) to hundreds. Most aggregates were large enough to be seen at 10× magnification. Cellular detail required either 40× or 100× (oil) magnification. Some aggregates contained only toxic heterophils; others contained only normal heterophils. Mixed aggregates containing normal lymphoid and monocytoid cells or reactive types were found in the clusters along with granulocytes. Reactive basophils were in some aggregates with granulocytes. Eosinophils were not found. Although also present along with leukergy, emboli composed of thrombocytes alone were not considered to represent the phenomenon. Heterophil/lymphocyte (H/L) ratios and total white blood (TWBCs) were computed by counting isolated cells and did not include cells of aggregates. Blood having high TWBC (> 100K) and low H/L (~0.1-0.6) ratios can contain aggregates. Leukergy could also be found in some blood samples with “normal” TWBC (~30K) levels. Bacteria were commonly observed in leukergy-positive blood samples and some contained bacteria attached to the leukocytes or to erythrocytes. Conclusions: leukocyte aggregates containing 3 to hundreds of cells (leukergy) were in blood of commercial hens. The aggregates contained normal heterophils, toxic heterophils, and other leukocytes. Bacteria were common in positive samples. Microbial toxins likely affected cell surfaces, resulting in aggregations. Detecting leukergy during a standard differential count (SDC) demonstrates a cellular stress behavior. Leukergy implies infection, regardless of H/L ratios or the TWBC.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.001 | 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".