A client with acquired immune deficiency syndrome (AIDS) and Pneumocystis jiroveci pneumonia has a CD4+ T cell count of 200 cells/mm³ (20%). The client asks the nurse why they have these recurring massive infections. Which pathophysiologic mechanism should the nurse describe in response to this client's question?

Reference Range:
T-helper CD4 cells [600 to 1500 cells/mm³ (60 to 75%)]

Choice A reason: This is incorrect because teaching the client to wear a mask, hand wash, and social distance is not the most important action for the nurse to take. These are preventive measures that should be followed by everyone, regardless of their COVID-19 status.

Choice B reason: This is correct because isolating the client from other clients, family, and healthcare workers not wearing proper PPE is the most important action for the nurse to take. This is to prevent transmission of COVID-19 to others who may be at risk of severe complications or death.

Choice C reason: This is incorrect because reporting the COVID-19 result to the local health department according to CDC guidelines is not the most important action for the nurse to take. This is a legal and ethical obligation that should be done after confirming the diagnosis, but it does not have an immediate impact on the client's health or safety.

Choice D reason: This is incorrect because explaining to the client to inform others that they may have been potentially exposed in the last 14 days is not the most important action for the nurse to take. This is a moral and social responsibility that should be done as soon as possible, but it does not address the urgent need of isolating the client from potential sources of infection.

Choice A reason: This is incorrect because reviewing the need for pneumococcal vaccine is not the most important intervention for the nurse to implement. Pneumococcal vaccine is recommended for people who are at high risk of pneumococcal infections, such as those with chronic diseases or immunosuppression. However, it is not a priority action for a client with neutropenia, which is a low number of neutrophils that increases the risk of bacterial and fungal infections.

Choice B reason: This is incorrect because implementing bleeding precautions is not the most important intervention for the nurse to implement. Bleeding precautions are indicated for clients who have thrombocytopenia, which is a low number of platelets that impairs blood clotting. However, this is not the case for a client with neutropenia, which affects the white blood cells that fight infections.

Choice C reason: This is incorrect because assessing vital signs every 4 hours is not the most important intervention for the nurse to implement. Vital signs are important indicators of the client's health status and may reveal signs of infection, such as fever, tachycardia, or hypotension. However, this is not a sufficient measure to prevent or treat infections in a client with neutropenia, who needs more aggressive and proactive interventions.

Choice D reason: This is correct because placing the client in protective isolation is the most important intervention for the nurse to implement. Protective isolation, also known as reverse isolation or neutropenic precautions, is a set of measures that aim to protect the client from exposure to pathogens that may cause infections. These include wearing gloves, masks, gowns, and eye protection; using sterile equipment and techniques; avoiding contact with people who are sick or have infections; and restricting visitors and fresh flowers or fruits.