Further study showed that clostridial toxin genes were detected in both HBS and control animals. A. fumigatus could only be detected in all HBS cow but not in the control.

• 经进一步研究表明,在HBS病牛和对照奶牛中都检测到梭菌毒素基因,而烟曲霉菌只在患病奶牛中检测到,对照牛则呈阴性。