Gram-negative short bacillus is a Gram-negative bacteria, Gram stain can be divided into negative and positive bacteria, negative bacteria is part of it, short bacillus is a description of the shape of bacteria, many bacteria can be described as short bacillus such as Bordetella pertussis, but it is specifically described as Gram-negative short bacillus or oval bacteria, so it is not exactly all short bacillus form, there are also may be in other shapes. For Brucella, it can also be a Gram-negative short bacillus, which can be a Gram-negative cocci or a short small bacillus. Yersinia pestis can also be a Gram-negative short bacillus, but it is specifically described as a Gram-negative ovoid short bacillus. So Gram-negative short bacilli describe the staining characteristics and the appearance of the bacteria, and further identification of which specific bacteria is needed.