Final answer:
The nurse's priority action for a client with compromised immunity is to implement transmission-based precautions, including strict hand hygiene protocols.
Step-by-step explanation:
The nurse's priority action for a client with compromised immunity is to implement transmission-based precautions. This involves taking measures to prevent the spread of pathogens in a healthcare setting. One key component of transmission-based precautions is the use of strict hand hygiene protocols, which includes proper handwashing techniques and the use of hand sanitizers. By following these precautions, the nurse can minimize the risk of infection and protect the client's health.