Final answer:
The nurse should prioritize the follow-up of the client's pulse rate of 126/min.
Step-by-step explanation:
When a client with influenza is admitted for IV fluids, the nurse should prioritize the follow-up of the pulse rate of 126/min. A pulse rate of 126/min is considered high and can be a sign of dehydration or other complications. The nurse should monitor the client's pulse rate regularly to ensure that it remains within a normal range.