Final answer:
The nurse should monitor the patient's CD4 count when administering maraviroc (Selzentry) to a patient with HIV infection.
Step-by-step explanation:
The nurse should monitor the patient's CD4 count when administering maraviroc (Selzentry) to a patient with HIV infection. CD4 cells, also known as T cells, play a critical role in the immune system's response to HIV. By monitoring the CD4 count, the nurse can assess the patient's immune function and determine the effectiveness of the treatment.