Immunologic Features of Porcine Circovirus Type 2 Infection
Bibliographic record
Abstract
Clinical expression of porcine circovirus 2 (PCV-2) infection in swine may result in two distinct high mortality disease syndromes. In North America, postweaning multisystemic wasting syndrome (PMWS), while still sporadic in incidence, predominates. In Europe and elsewhere, both PMWS and a second syndrome, porcine dermatitis and nephropathy syndrome (PDNS), occur in endemic and epidemic forms. PMWS but not PDNS has been reproduced in piglets by inoculations with PCV-2 alone or in PCV-2-infected swine co-infected with porcine parvovirus (PPV) or porcine respiratory and reproductive syndrome (PRRS) virus and also if PCV-2-infected piglets are immunostimulated by injections with an immunogen emulsified in an oil-based macrophage-targeted adjuvant. Subclinical but active infection has been achieved by direct inoculation of piglets with cloned PCV-2 DNA and/or progeny virus derived from cloned DNA. Morphologic changes in lymphoid tissues and preliminary functional data suggest that immunosuppression may occur in PMWS-affected swine. This phenomenon appears to be mediated by generalized lymphoid depletion and replacement by infiltrating and proliferating histiocytes and macrophages. Accumulation of virus in both mononuclear phagocytes and follicular dendritic cells is characteristic of PCV-2 infection. Exogenous immunosuppression of PCV-2-infected gnotobiotic piglets with cyclosporine (Cys), but not corticosteroid (St), potentiates PCV-2 replication and promotes productive virus infection of hepatocytes in Cys-treated piglets, a tropism not previously apparent in experimentally induced PMWS in gnotobiotic swine. In the Cys-treated piglets, inflammatory lesions characteristic of PMWS are absent, even though tissues contain high titers of infectious virus, a finding which suggests that the granulomatous inflammatory lesions characteristic of PMWS are immune mediated.
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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 | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".