Brucella abortus

suis, which infects pigs; B. abortus, which occurs in cattle; and B. canis, which infects dogs. The infection may not be apparent in animals, for the brucellae and animals that they infect have become fairly well adapted to one another. In cattle, for example, the only signs of illness…

…veterinarian who in 1897 discovered Brucella abortus (Bang’s bacillus), the causative agent of contagious abortion in cattle and of brucellosis (undulant fever) in human beings.