{
  "abstract": "Swine influenza A virus (swIAV) is an endemic respiratory pathogen of pigs with zoonotic relevance. We analysed retrospective serological data from routine diagnostic submissions (January 2023-May 2026) to a single laboratory, comprising 2003 sera from 66 reports on 44 commercial farrow-to-finish farms in seven regions of mainland Greece, tested with a nucleoprotein ELISA that cannot distinguish vaccine-, maternally, or infection-derived antibodies. Overall seroprevalence was 46.4% (929/2003; farm-clustered 95% CI 39.1-53.8%); at least one seropositive animal was found in 51 of 61 farm-years and in 36 of 44 farms. Seroprevalence differed by production stage (p < 0.001): it was highest in multiparous sows (75.9%) and suckling piglets (70.7%), both likely influenced by sow vaccination and maternally derived antibodies, intermediate in gilts (46.0%) and nursery pigs (38.6%), and lowest in growers (24.8%) and finishers (24.0%), in which antibodies indicate prior exposure rather than current circulation. No consistent temporal trend was detected, although some adjusted models suggested higher seroprevalence in 2025-2026. Regional seroprevalence ranged from 10.1% (Thessaly) to 61.0% (West Greece); the association was significant with the standard but not the bias-reduced cluster-robust estimator (p = 0.014 and p = 0.39) and persisted after adjustment for year and stage, but it rests on few farms per region and is considered exploratory. As a convenience sample of diagnostic submissions, these data provide descriptive rather than nationally representative estimates and support the addition of molecular, subtype-level surveillance.",
  "abstract_shown": true,
  "affiliations": [
    "Clinic of Medicine, Faculty of Veterinary Medicine, University of Thessaly, 43100 Karditsa, Greece.",
    "Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA.",
    "Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Thessaly, 43100 Karditsa, Greece.",
    "Swine Technical Support, Hipra Hellas SA, 10441 Athens, Greece.",
    "Department of Microbiology and Parasitology, Faculty of Veterinary Medicine, University of Thessaly, 43100 Karditsa, Greece."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Vasileios G Papatsiros",
      "orcid": "0000-0003-4955-0460"
    },
    {
      "affs": [
        0
      ],
      "name": "Georgios I Papakonstantinou",
      "orcid": "0000-0002-3434-0877"
    },
    {
      "affs": [
        1
      ],
      "name": "Constantinos S Kyriakis"
    },
    {
      "affs": [
        1
      ],
      "name": "Dimitrios C Sakkas",
      "orcid": "0009-0003-4766-1447"
    },
    {
      "affs": [
        2
      ],
      "name": "Zoi Prentza",
      "orcid": "0000-0002-4839-8332"
    },
    {
      "affs": [
        3
      ],
      "name": "Ilias Terzidis"
    },
    {
      "affs": [
        2
      ],
      "name": "Konstantinos Koutoulis",
      "orcid": "0000-0002-0240-4194"
    },
    {
      "affs": [
        4
      ],
      "name": "Charalambos Billinis"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2pkb2q9j5ad8f.bib",
  "cited_by": 0,
  "doi": "10.3390/vetsci13101041",
  "fulltext_url": "https://europepmc.org/articles/PMC13709385",
  "id": "2pkb2q9j5ad8f",
  "issns": [
    "2306-7381"
  ],
  "landing_url": "https://europepmc.org/article/MED/42944137",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2713|Influenza Virus Research Studies"
    ]
  ],
  "openalex": "W7216068983",
  "pdf_url": "https://europepmc.org/articles/PMC13709385?pdf=render",
  "pmcid": "PMC13709385",
  "pmid": "42944137",
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2pkb2q9j5ad8f.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:24Z",
      "native_id": "MED:42944137",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42944137"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "openalex:2713|Influenza Virus Research Studies",
      "subfield": "epidemiology-public-health"
    }
  ],
  "title": "Seroprevalence of Swine Influenza A Virus (swIAV) in Commercial Pig Farms in Greece (2023-2026): Age, Regional and Temporal Patterns.",
  "title_text": "Seroprevalence of Swine Influenza A Virus (swIAV) in Commercial Pig Farms in Greece (2023-2026): Age, Regional and Temporal Patterns.",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:22:24Z",
  "url": "https://research.draconitic.com/paper/2pkb2q9j5ad8f",
  "venue": "Veterinary sciences",
  "versions": []
}