用于食用的牛和鸡经常被喂食会传播病毒的饲料，该病毒引起这种疾病。
Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease.
钙剂缺乏是引起这种疾病的主要原因。
口腔中的细菌引起这种疾病可以收缩甚至仓鼠谁获得尽可能最好的照顾。
The bacteria that cause this illness can be contracted even by hamsters who receive the best possible care.
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