Child dizziness, vomiting blood, high blood test results - what are the reasons?

Patient's question:

Appetite is fine, deep sleep is fine, bowel and bladder functions are normal, fever was brought on, EEG is normal, IV fluids for a week reduced the white blood cell count from 11,000 to 19,000, then IV fluids for another 11 days reduced it to 12,000, took some medicine and discharged after a few days, took medicine for 5 days and the white blood cell count rose again to 14,000, checked again after a few days and it was 12,200, now has been experiencing dizziness and nausea, Hello, what could be the reason?
Previous treatment and outcomes: 20 days ago, treated for fever, white blood cell count was 11,000---19,000. What kind of assistance is needed: Hello, what could be the reason?

Doctor's answer:

In my class, the child has had a fever of 39 degrees for about ten days and should definitely be admitted to the hospital. Why would they only check a blood test when they went out? Tests for sputum, virus, pneumonia, mycoplasma antibodies, FQ-MP-DNA, chest X-ray, and sputum culture are all necessary. How can antibiotics like cephalexin work if the virus hasn’t been eliminated? Moreover, mycoplasma hasn’t been ruled out yet. Once you complete these tests and identify the cause, using targeted medication will help your child recover quickly. Of course, these tests are all done after admission, not in the outpatient clinic.

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