
Hello Regina,
One of the most frightening causes of low levels of white blood cells is leukemia, a type of cancer that destroys the cells. Less serious causes include the effect of prescription medication, viruses, and autoimmune disorders.
Sometimes white blood cell counts are low when there is an infection that is so severe, the body cannot manufacture the disease fighting cells fast enough to fight the infection.
You can find a complete overview of the possible causes at the link below.
Kathleen
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Posted by regina