Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria (EEA) Balcarce, Ruta Nacional 226 km 73.5, 7620 Buenos Aires, Argentina.
Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria (EEA) Balcarce, Ruta Nacional 226 km 73.5, 7620 Buenos Aires, Argentina.
Rev Argent Microbiol. 2022 Oct-Dec;54(4):299-304. doi: 10.1016/j.ram.2022.02.005. Epub 2022 May 21.
Bovine respiratory disease (BRD) is one of the most frequent clinical concerns in weaned calves after their arrival at the feedlot. This work reports the first local isolation of Mycoplasma bovis from feedlot calves with pneumonia and polyarthritis in Argentina. Twenty four out of 545 calves showed progressive, subacute to chronic respiratory distress, coughing, and fever. Thirty percent of the affected calves also showed lameness and swelling of elbow or carpal, and knee or tarsal joints. Five necropsies were performed and severe multifocal to coalescent pulmonary nodules, containing white-yellowish caseous exudate encircled by fibrous tissue, and fibrinonecrotic arthritis and tenosynovitis were detected. Mycoplasma was isolated from lung and joint samples. The 16S-23S rRNA ITS consensus sequence obtained from these isolates showed 100% similarity with the same region of M. bovis strains. Since there are no commercially available vaccines in the region for the prevention and control of M. bovis pneumonia and arthritis, surveillance is a priority to reduce the source of disease to naïve animals.
牛呼吸道疾病（BRD）是断奶犊牛到达饲养场后最常见的临床问题之一。本研究报告了在阿根廷，从患有肺炎和多发性关节炎的饲养场犊牛中首次分离到牛支原体。545 头犊牛中有 24 头发病，表现为进行性、亚急性至慢性呼吸窘迫、咳嗽和发热。30%的患病犊牛还出现四肢僵硬和肘部或腕关节、膝关节或跗关节肿胀。进行了 5 次剖检，发现肺部有严重的多灶性至融合性小结节，含有白色-黄白色干酪样渗出物，周围环绕着纤维组织，以及纤维蛋白坏死性关节炎和腱鞘炎。从肺部和关节样本中分离出支原体。从这些分离株获得的 16S-23S rRNA ITS 保守序列与牛支原体菌株的同一区域显示出 100%的相似性。由于该地区没有可用于预防和控制牛支原体肺炎和关节炎的商业疫苗，因此监测是减少疾病源向新生动物传播的优先事项。
