Cows may spread two serious diseases in milk . One is bovine tuberculosis . The other is called bang 's disease when . It affects cows , and undulant fever when it invades the human body .

奶牛在牛奶中可传播两种严重疾病。一种是牛结核，另一种，在影响奶牛时，叫牛布鲁菌病，侵人人体时则称作波状热。