Oropharyngeal swab sampling for PRRSV detection in large-scale pig farms: a convenient and reliable method for mass sampling.

IF 3 2区 农林科学 Q1 VETERINARY SCIENCES
Mingyu Fan, Yang Li, Zhiqiang Hu, Lujie Bian, Weisheng Wu, Wei Liu, Meng Li, Xinglong Wang, Jing Ren, Lili Wu, Xiaowen Li
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Abstract

Background: Porcine reproductive and respiratory syndrome virus (PRRSV) has significant productivity and economic impacts in swine herds. Accurately determining the PRRSV status at the herd level is crucial for producers and veterinarians to implement strategies to control and eliminate the virus from infected herds. This study collected oropharyngeal swabs (OSs), nasal swabs (NSs), oral fluid swabs (OFs), rectal swabs (RSs), and serum samples continuously from PRRSV challenged pigs under experimental conditions and growing pigs under field conditions. Additionally, OSs and serum samples were collected from individual sows from 50 large-scale breeding farms, and the collection of OSs does not require the sows to be restrained. Ct values of PRRSV were detected in all samples using real-time reverse transcriptase-polymerase chain reaction (RT-qPCR).

Results: In PRRSV challenged pigs, OSs showed a higher PRRSV-positive rate until the end of the observation period. The Ct values of OSs were significantly lower than those of NSs, OFs, and RSs at 2, 8, 12, 14 and 20 days post-challenge (DPC) (P < 0.05). For growing pigs, the positivity rate of PRRSV in OSs was higher than that in other sample types at 30, 70, and 110 days of age. In sows, 24,718 OSs and 6259 serum samples were collected, with PRRSV-positive rate in OSs (9.4%) being significantly higher than in serum (4.1%) (P < 0.05). However, the Ct values of PRRSV RNA in serum were significantly lower than those in OSs (P < 0.001).

Conclusions: The OSs sample type yielded higher PRRSV-positive rates for longer periods compared to NSs, RSs, OFs and serum samples for PRRSV detection in infected pigs. Therefore, OSs has a good potential to be a convenient, practical, and reliable sample type for implementing mass sampling and testing of PRRSV in large-scale pig farms.

口咽拭子采样用于大规模猪场的 PRRSV 检测:一种方便可靠的大规模采样方法。
背景:猪繁殖与呼吸综合征病毒(PRRSV)对猪群的生产力和经济有重大影响。准确确定猪群的 PRRSV 状态对于生产者和兽医实施控制和消除感染猪群病毒的策略至关重要。本研究在实验条件下连续采集受 PRRSV 挑战的猪的口咽拭子 (OS)、鼻拭子 (NS)、口腔液拭子 (OF)、直肠拭子 (RS) 和血清样本,在现场条件下连续采集生长猪的口咽拭子 (OS)、鼻拭子 (NS)、口腔液拭子 (OF)、直肠拭子 (RS) 和血清样本。此外,还从 50 个大型繁殖场的母猪身上采集了拭子和血清样本,采集拭子时不需要对母猪进行约束。使用实时反转录聚合酶链反应(RT-qPCR)检测所有样本中 PRRSV 的 Ct 值:结果:在受到 PRRSV 挑战的猪只中,OS 的 PRRSV 阳性率较高,直到观察期结束。在挑战后 2、8、12、14 和 20 天(DPC),OSs 的 Ct 值明显低于 NSs、OFs 和 RSs(P 结论:OSs 样本类型的 PRRSV 阳性率更高:与 NSs、RSs、OFs 和血清样本相比,OSs 样本类型在感染猪 PRRSV 检测中可在更长的时间内获得更高的 PRRSV 阳性率。因此,OSs 很有可能成为一种方便、实用、可靠的样本类型,用于在大规模猪场实施 PRRSV 的大规模采样和检测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Porcine Health Management
Porcine Health Management Veterinary-Food Animals
CiteScore
5.40
自引率
5.90%
发文量
49
审稿时长
14 weeks
期刊介绍: Porcine Health Management (PHM) is an open access peer-reviewed journal that aims to publish relevant, novel and revised information regarding all aspects of swine health medicine and production.
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