A nurse is providing care for clients in a hospital setting. Which of the following clients is at highest risk for developing an opportunistic infection?

Choice A rationale Osteoarthritis is a non-inflammatory degenerative joint disease characterized by cartilage breakdown. While it causes pain and functional impairment, it does not directly suppress the immune system or increase susceptibility to opportunistic infections. The risk for opportunistic infections is directly related to impaired cellular immunity. Choice B rationale Rheumatoid arthritis (RA) is a chronic autoimmune disease causing systemic inflammation. While the disease itself can affect the immune system, the highest risk for opportunistic infection typically arises from the immunosuppressive medications used to treat the flare-up (e.g., corticosteroids, biologics), rather than the disease state alone. Choice C rationale A client with HIV (Human Immunodeficiency Virus) experiences a progressive decline in the number and function of CD4+ T-lymphocytes. These cells are central to cell-mediated immunity, and their depletion allows opportunistic pathogens (e.g., Pneumocystis jirovecii, Mycobacterium avium) that are normally controlled by a healthy immune system to cause severe, life-threatening infections. Choice D rationale A client with a risk of severe anaphylaxis has a hyperactive immune response (Type I hypersensitivity) to an antigen. This is an inappropriate, exaggerated immune reaction that is not characterized by generalized immunosuppression; therefore, it does not increase the risk for opportunistic infections.