Hälli Outi, Haimi-Hakala Minna, Oliviero Claudio, Heinonen Mari
Department of Production Animal Medicine, University of Helsinki, Paroninkuja 20, FI-04920 Saarentaus, Finland.
Porcine Health Manag. 2020 Sep 2;6:21. doi: 10.1186/s40813-020-00156-0. eCollection 2020.
Chronic pleurisy is a common finding in slaughtered pigs in post-mortem meat inspection. The prevalence of pleurisy has been increasing during the last decade also in Finland. The aim of this prospective case-control study was to search for environmental, infectious and management-related herd-level risk factors for pleurisy in the slaughterhouse. Altogether 46 Finnish pig herds, including 25 control (low pleurisy prevalence in meat inspection) and 21 case (high pleurisy) herds, were enrolled in the study and visited during the tenth week of the rearing period of finishing pigs. Herd personnel were asked about basic herd information, management and environmental factors. Selected pigs were examined clinically, environmental parameters were measured and 15 blood samples per herd were taken during herd visits. Antibodies against serotype 2 (APP2) and ApxIV toxin and swine influenza virus were measured. After the slaughter of study pigs, meat inspection results of the batch were gathered from slaughterhouses. Multivariate logistic regression model was built to identify possible risk factors for a herd to be a case herd (i.e. having high pleurisy values).
Finishing herd type and herd size were observed to act as risk factors. None of clinical signs of pigs, management-related factors or environmental measurements were associated with herd status.
As previously known, in endemic and subclinical infections such as APP, herd factors are important, but detailed risk factors seem to be difficult to identify.
慢性胸膜炎是宰后猪肉检验中屠宰猪常见的病变。在过去十年里，芬兰胸膜炎的患病率也在上升。这项前瞻性病例对照研究的目的是寻找屠宰场中与胸膜炎相关的环境、感染和管理方面的畜群水平风险因素。共有46个芬兰猪群参与了该研究，其中包括25个对照群（宰后检验中胸膜炎患病率低）和21个病例群（胸膜炎患病率高），并在育肥猪饲养期的第十周进行了走访。向畜群工作人员询问了畜群的基本信息、管理和环境因素。对选定的猪进行了临床检查，测量了环境参数，并在走访畜群期间每个畜群采集了15份血样。检测了针对血清型2（APP2）、ApxIV毒素和猪流感病毒的抗体。在研究猪屠宰后，从屠宰场收集了该批次的宰后检验结果。建立了多变量逻辑回归模型，以确定畜群成为病例群（即胸膜炎值高）的可能风险因素。
观察到育肥猪群类型和畜群规模为风险因素。猪的临床症状、管理相关因素或环境测量结果均与畜群状况无关。
如先前所知，在诸如APP等地方性和亚临床感染中，畜群因素很重要，但详细的风险因素似乎难以确定。
