At last measurement, the client’s vital signs were as follow…

At last measurement, the client’s vital signs were as follows: oral temperature 98°F (36.7°C), heart rate 76 beats/min, respiratory rate 16 breaths/min, and blood pressure (BP) 118/60 mm Hg. Four hours later, the vital signs are as follows: oral temperature 103.2°F (38.5°C), heart rate 76 beats/min, respiratory rate 14 breaths/min, and blood pressure 120/66 mm Hg. Which should be the nurse’s first intervention at this time?