Persistent fever with high white blood cells indicates that the fever is mostly caused by bacterial infections, and further appropriate tests are needed to clarify the location and extent of the infection. For example, pneumonia, lung abscess, biliary tract infection, pyelonephritis, urinary tract infection, cellulitis, sepsis, etc. may be caused by bacterial infections. In this case, it is necessary to improve the blood routine, calcitoninogen, chest X-ray, CT examination, urine routine, abdominal ultrasound and other corresponding examinations to clarify the site of infection. Through effective antibiotic anti-infection treatment, most patients with elevated leukocytes and fever can have their disease effectively controlled. However, it should be noted that certain hematological diseases, such as leukemia and lymphoma, can also cause a significant increase in leukocytes with fever, and a bone marrow examination is needed to clarify the cause.
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