Leucocytosis - Definition

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Leukocytes are white blood cells that enter into the functioning of the body's immune system, among others. Leukocytosis denotes a high rate of leukocytes present in the blood. Generally, leukocytosis is a transient phenomenon that occurs during a bacterial infection in most cases, and it is reversible when the body, with the help of antibiotics, gets rid of the bacteria. However, leukocytosis may also be found in other more serious cases, which is the case in certain leukemias or myeloproliferative syndromes affecting the bone marrow, or certain cancers.