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Hi Anon, 

A low WBC or White Blood Cell count is usually caused by one of the following:

• Viral infections that temporarily disrupt bone marrow function
• Congenital disorders characterized by diminished bone marrow function
• Cancer or other diseases that damage bone marrow
• Autoimmune disorders that destroy white blood cells or bone marrow cells
• Overwhelming infections that use up white blood cells faster than they can be produced
• Drugs that destroy white blood cells or damage bone marrow

If you were just sick-- this would explain a low WBC. But for a specific reason as to why your WBC's were low, then you will have to discuss this with your doctor.

Best Wishes,

Rosa