Hello girls! My son is 3 years old, 10 days ago he started coughing, s…

Hello girls! My son is 3 years old, 10 days ago he started coughing, sore throat, temperature, runny nose. We treated him at home for 5 days. 5 days ago we took him to the doctor and he was prescribed antibiotics, etc. Now the cough, sore throat, and runny nose have all gone. You wouldn't know that he's sick by looking at him. Excellent. We still take antibiotics, but as the temperature was initially, so it remains. In the morning, afternoon, and evening, 37.2-37.4 consistently. A general blood test was done, the results were good. Has anyone encountered something like this? Why is his temperature still high?