This image illustrates the specific morphological characteristics of three different organisms grown on MacConkey Agar. Top: Escherichia coli, Bottom left: Proteus vulgaris, Bottom right ...

死亡病例中多数接受了抗生素治疗，且病情危重，常见的致病菌有肺炎克雷伯菌等。康复患者中多数也接受了抗生素治疗，但细菌感染确诊较少。两组在胸部 X 线异常、氧饱和度、基础疾病、血液标志物和多器官衰竭等方面存在显著差异，死亡病例的相关指标表现更差。

Mastitis is the most frequent infectious disease that causes the greatest losses for dairy cattle (Langoni et al. 1998, Costa et al. 1999) and may be subclinically or clinically (Munoz et al. 2006).