Final answer:
The nurse should wear gloves and a mask and change gloves after bathing each lesion. They can use a chlorhexidine-based cleanser but it may not be specified. The nurse should keep the lesions covered.
Step-by-step explanation:
The nurse should incorporate wearing gloves and a mask into the plan when bathing and changing the bed linens of a client with cutaneous Kaposi's sarcoma lesions that are open and draining serous fluid. Wearing gloves and a mask helps protect the nurse from exposure to the serous fluid and potential transmission of the disease. Additionally, it is important for the nurse to change gloves after bathing each lesion to prevent cross-contamination. Using a chlorhexidine-based cleanser can help disinfect the skin and promote healing, but it may not be specified in this scenario. Lastly, the nurse should keep the lesions covered to prevent the spread of infection.