Final answer:
The nurse should implement precaution D and wear a gown when caring for the client who has diarrhea due to shigella.
Step-by-step explanation:
The nurse should implement precaution D and wear a gown when caring for the client who has diarrhea due to shigella. Wearing a gown will help prevent the spread of the infection and protect the nurse from coming into direct contact with the client's bodily fluids.