White blood cells: are comprised mostly of neutrophils and lymphocytes. If the number of lymphocytes are low then percentage of neutrophils will naturally be high, even though there numbers are normal. Viral infections (HIV and others) are a common cause of low lymphocyte counts. From a practical standpoint, it may not be necessary to test for the other types of infection if the counts are not dangerously low.
Answered 1/5/2019
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