What should be done if a child has leukopenia?

Patient's question:

.5 years old
Detailed medical condition and consultation purpose: After a child with upper respiratory infection took Azithromycin for one day, there was leukopenia. What is the cause? How should it be treated?
Duration of this illness: One day
Current general condition: Fatigue, lack of energy.

Doctor's answer:

Hello, regarding the situation you mentioned, having very low white blood cells is a very dangerous condition.
Based solely on this set of data, it is indeed not possible to determine the specific issue. It is recommended that you promptly visit a higher-level hospital for examination. Conduct a detailed and thorough check to identify the specific cause, and then proceed with appropriate treatment.