兽医发现马匹持续发热并有鼻腔分泌物后，立即采样送检，以排除鼻疽。
After the veterinarian found that the horse had a persistent fever and nasal discharge, they immediately collected a sample for testing to rule out glanders.
After the veterinarian found that the horse had a persistent fever and nasal discharge, they immediately collected a sample for testing to rule out glanders.