Fever with normal blood work can be seen in viral infections or atypical pathogenic infections, tuberculosis infections. In viral infections, the total white blood cell count is not high and the percentage of neutrophils is not high, and some patients may show mild elevation of lymphocytes. Mycoplasma, Chlamydia and Legionella are atypical pathogenic infections, and the pathogens do not cause elevated leukocytes. There is also tuberculosis, and tuberculosis infections are specific bacteria that also do not cause elevated leukocyte and neutrophil ratios. Fever with normal blood count, also consider non-infectious diseases, such as rheumatic immune system diseases, such as rheumatism, rheumatoid, systemic lupus erythematosus, etc. Rheumatic immune system diseases can have normal blood count. Also in the case of malignant tumors, there can be symptoms of fever and the blood routine can be normal.