Final answer:
An immunocompromised patient should be placed in an isolation room with positive pressure ventilation to prevent infection from outside sources. Hospital staff interacting with such patients must follow strict hygiene and disinfection protocols.
Step-by-step explanation:
A nurse should place an immunocompromised patient in an isolation room with positive pressure ventilation. This type of room helps to protect the patient by maintaining a higher air pressure inside the room than the air pressure outside of the room. This prevents contaminated air from flowing into the room and helps keep the environment sterile. In the case of Marisa, who was isolated, this means that all hospital staff must adhere to strict protocols to prevent the spread of infection. This includes stringent hand hygiene practices and careful disinfection of any items in contact with her.