A nurse is caring for a client with acquired immunodeficiency syndrome (AIDS) who has a CD4+ T-cell count of 220 cells/mm³. Which nursing intervention should be the highest priority to ensure client safety?

With a CD4+ count of 220 cells/mm³, the client is immunocompromised, making infection prevention through strict hand hygiene and PPE the highest priority for safety. Other interventions are important but do not address the immediate risk of infections.

Understanding the Priority
For a client with AIDS and a CD4+ T-cell count of 220 cells/mm³, the immune system is severely compromised. This level of immunosuppression defines the transition from HIV infection to AIDS, signifying a profound vulnerability to opportunistic infections. The highest priority nursing intervention must directly address the most immediate threat to physiological safety, which is infection prevention.

Why Infection Control is the Priority
The core pathophysiology of HIV/AIDS involves the depletion of CD4+ T-cells, the master regulators of the adaptive immune response. With a count of 220 cells/mm³, the client's body cannot mount an effective defense against pathogens that a healthy immune system would easily eliminate. This state leads to the development of opportunistic infections, which are the primary cause of morbidity and mortality in this population ^[1]. The systematic review on HIV patients notes that HIV-induced AIDS attacks the immune system, directly leading to these opportunistic infections ^[1]. Therefore, the most critical safety intervention is to create a protective barrier between the client and environmental pathogens. Implementing strict hand hygiene and using personal protective equipment for all interactions directly breaks the chain of infection at its most common point of transmission—contact with healthcare workers.

Analysis of Other Options
While the other interventions are important components of holistic care, they do not address the most immediate, life-threatening safety risk.
- Administering antiretroviral therapy (option 2) is crucial for long-term viral suppression and immune reconstitution, but it does not provide immediate protection against the pathogens already present in the environment.
- Encouraging fluid intake (option 3) is a supportive measure for general health but is not a direct safety intervention for the primary risk of infection.
- Providing emotional support (option 4) addresses psychosocial needs, which, following Maslow's hierarchy, are secondary to the critical physiological need for safety from infection.

Connecting the Evidence to Clinical Judgment
The narrative review on sepsis and gut microbiota reinforces the concept of a vicious cycle between immune dysfunction and infection, where a compromised host is highly susceptible to pathogenic invasion . Although the COVID-19 vaccine trial data focuses on a different context, the underlying principle remains consistent: individuals with weakened immune systems, defined in that study as a "tempered immune system," are at a significantly higher risk for poor outcomes from infectious diseases . For a nurse at the bedside, translating this evidence into practice means prioritizing interventions that provide an immediate, physical shield against infection. The systematic review on cataracts in HIV patients further illustrates that even controlled clinical procedures carry heightened risks of postoperative complications like uveitis due to the underlying immunodeficiency ^[1]. This underscores that any breach in the client's first line of defense—their skin and mucous membranes—or exposure to unsterile environments can have severe consequences. Therefore, rigorous infection control is not merely a routine task but a critical, evidence-based safety intervention that directly mitigates the most significant threat identified for this client.