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Reference.org
Leukopenia
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<p>Leukopenia is a decrease in the number of <a href="/facts/Leukocytes/vsDunUK0">leukocytes</a> (WBC). Found in the blood, they are the <a href="/facts/White_blood_cells/vsDunUK0">white blood cells</a>, and are the body's primary defense against an <a href="/facts/Infection/182XrncP">infection</a>. Thus the condition of leukopenia places individuals at increased risk of infection. </p>