Department of Population Medicine, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1 (Melmer, O'Sullivan, Greer, Friendship, Bonin Ferreira, Poljak); South West Ontario Veterinary Services, 500 Wright Blvd., Stratford, Ontario N4Z 1H3 (Moser); Department of Population Health and Pathology, North Carolina State University, 1060 William Moore Drive, Raleigh, North Carolina 27607, USA (Bonin Ferreira).
Can Vet J. 2024 Nov;65(11):1149-1156.
Porcine reproductive and respiratory syndrome (PRRS) is one of the important endemic diseases in swine populations. Monitoring PRRS frequency in commercial herd populations has often been based on laboratory submissions. However, a limitation of this approach is that new clinical outbreaks of PRRS are challenging to identify if epidemiological information is not provided. This hinders the estimation of basic measures such as incidence.
The objectives of this study were to describe a system to monitor new clinical outbreaks in Ontario sow herds and to report the incidence of clinical PRRS outbreaks in a subset of Ontario sow herds.
We compared herd-level outbreak data from January 1, 2017 to December 31, 2019. Cases were confirmed as positive based on observation of sow herds with typical clinical signs suggestive of PRRS, followed by laboratory confirmation of the PRRS virus.
The incidences from year to year were similar ( = 0.058) and were lower compared to estimates in the United States. Descriptively, the highest cumulative incidence was during 2018 (annual incidence risk = 0.067 cases per 100 sow herds, 95% CI = 0.050 to 0.090). This was characterized by an unusually high number of cases reported in the summer.
猪繁殖与呼吸综合征（PRRS）是猪群中一种重要的地方性疾病。商业猪群中 PRRS 的监测频率通常基于实验室提交的结果。然而，这种方法的局限性在于，如果没有提供流行病学信息，就很难识别新的 PRRS 临床暴发。这阻碍了对发病率等基本措施的估计。
本研究旨在描述一种监测安大略省母猪群中新临床暴发的系统，并报告安大略省母猪群中部分猪群的临床 PRRS 暴发发病率。
我们比较了 2017 年 1 月 1 日至 2019 年 12 月 31 日的群体暴发数据。根据观察到具有 PRRS 典型临床症状的母猪群确诊病例，并通过实验室确认 PRRS 病毒。
每年的发病率相似（ = 0.058），且低于美国的估计值。描述性地，2018 年的累积发病率最高（每年发病率风险为每 100 头母猪群中出现 0.067 例病例，95%CI 为 0.050 至 0.090）。这一结果的特点是夏季报告的病例数量异常高。
