What to Do When a Child Has Severe Cough but Normal Blood Tests?

A child suddenly develops a severe cough, and the blood test results are normal. The doctor diagnosed it as bronchitis, prescribing intravenous injections and nebulizer treatment. However, after two days of injections, the child still had a fever of 39 degrees at around 6 PM in the evening. The doctor recommended taking ibuprofen, which did help lower the fever. Please ask the doctor to analyze the test results and predict how long the fever might last.
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