Navarro Teresa, Ortín Aurora, Cabezón Oscar, De Las Heras Marcelo, Lacasta Delia, González José María
Department of Animal Pathology, University of Zaragoza & AgriFood Institute of Aragón (IA2), 50013 Zaragoza, Spain.
Wildlife Conservation Medicine Research Group, Department of Medicine and Animal Surgery, Autonomous University of Barcelona, 08193 Barcelona, Spain.
Animals (Basel). 2021 Jan 12;11(1):160. doi: 10.3390/ani11010160.
The presence of respiratory viruses and pestiviruses in sheep has been widely demonstrated, and their ability to cause injury and predispose to respiratory processes have been proven experimentally. A longitudinal observational study was performed to determine the seroprevalence of bovine parainfluenza virus type 3 (BPIV-3), bovine respiratory syncytial virus (BRSV), bovine herpesvirus type 1 (BHV-1) and pestiviruses in 120 lambs at the beginning and the end of the fattening period. During this time, the animals were clinically monitored, their growth was recorded, and post-mortem examinations were performed in order to identify the presence of pneumonic lesions in the animals. Seroconversion to all viruses tested except BHV-1 was detected at the end of the period. Initially, BPIV-3 antibodies were the most frequently found, while the most common seroconversion through the analysed period occurred to BRSV. Only 10.8% of the lambs showed no detectable levels of antibodies against any of the tested viruses at the end of the survey. In addition, no statistical differences were found in the presentation of respiratory clinical signs, pneumonic lesions nor in the production performance between lambs that seroconverted and those which did not, except in the case of pestiviruses. The seroconversion to pestiviruses was associated with a reduction in the final weight of the lambs.
绵羊体内呼吸道病毒和瘟病毒的存在已得到广泛证实，并且它们造成损伤和引发呼吸道疾病的能力也已通过实验得到证明。进行了一项纵向观察研究，以确定120只羔羊在育肥期开始和结束时3型牛副流感病毒（BPIV-3）、牛呼吸道合胞病毒（BRSV）、1型牛疱疹病毒（BHV-1）和瘟病毒的血清阳性率。在此期间，对动物进行临床监测，记录其生长情况，并进行尸检以确定动物是否存在肺部病变。在育肥期末检测到除BHV-1外所有检测病毒的血清转化。最初，BPIV-3抗体是最常检测到的，而在整个分析期间最常见的血清转化发生在BRSV上。在调查结束时，只有10.8%的羔羊未检测到针对任何一种检测病毒的抗体水平。此外，在出现呼吸道临床症状、肺部病变以及血清转化和未血清转化的羔羊之间的生产性能方面，除瘟病毒外未发现统计学差异。瘟病毒的血清转化与羔羊最终体重的降低有关。
