Which of the following correctly classifies Yersinia enterocolitica?

Yersinia enterocolitica is correctly classified as a Gram negative rod. This classification stems from its cellular structure and staining characteristics. In the Gram stain procedure, Gram negative bacteria do not retain the crystal violet stain used and instead take up the counterstain, which is usually safranin, appearing red or pink under a microscope. Yersinia enterocolitica is also characterized by its rod shape, which distinguishes it from cocci, or spherical bacteria, that fall under the classifications of Gram positive or Gram negative based on their ability to retain the primary stain.

In clinical microbiology, recognizing Yersinia enterocolitica as a Gram negative rod is crucial for proper identification and treatment of infections caused by this organism. It is associated with gastrointestinal illness and can be differentiated from other Enterobacteriaceae based on its biochemistry and cultural characteristics. Understanding the correct classification can aid practitioners in implementing appropriate diagnostic and therapeutic measures.