A 5 year-old child is admitted to hospital with maculopapular rash for three days and a onset of high fever four days ago. A nasal swab reveals the child has the measles virus. The mother states that their child was not immunized. The child's vital signs are heart rate 99, temperature 98.7° F (37.1 °C), respiratory rate 16 breaths per minute. The child is sleeping comfortably in an isolation room. What is a nursing priority at this time?