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These drugs lower the white blood cell count to a greater degree than the counts of other blood cells â red blood cells and platelets â although these are commonly affected, too. Fortunately, the effect of these drugs on the white blood cell count is usually both predictable and short-lived. The white cell count generally falls below the normal range about seven to ten days after a chemotherapy treatment and recovers within about a week after that.
White blood cells contain the immune cells that attack and remove viruses and bacteria in a person's body. 1  Low WBC counts may indicate that a person is in danger of infection. High WBC counts might indicate an existing infection, tissue damage, or leukemia. Typical levels are 4,000-10,800 cells per micro-liter of a person's blood.