What personal protective equipment is essential for a nurse when assessing a patient under contact precautions for diarrhea caused by Clostridium difficile?

The use of gown as the correct answer is crucial when assessing a patient under contact precautions for diarrhea caused by Clostridium difficile. This organism is known to be transmitted through the fecal-oral route, particularly in healthcare settings, where it can survive on surfaces and equipment for extended periods.

Wearing a gown provides a barrier between the nurse's clothing and any potential contaminants from the patient or the environment. This is vital to prevent the transmission of the bacteria not only to the healthcare provider but also to other patients in the facility.

While masks, shoe covers, and eye protection can be relevant in certain situations, they are not the primary defenses against the transmission of C. difficile. The gown is specifically designed to protect against contact with potentially infectious materials, which directly addresses the risk posed by this particular pathogen. Thus, the gown is an essential part of the personal protective equipment when caring for such patients.