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This condition can be caused by certain medications and by infections. In some cases, it is caused by a cancer or precancerous condition. Myelofibrosis, bone marrow scarring that can result from various hematologic cancers, typically leads to low blood counts. Pancytopenia can also be caused by aplastic anemia, a bone marrow failure disorder that affects blood cell production.
However, there are viruses that can lower the number of a particular type of white blood cell. For example, with neutropenia, certain viruses (e.g. Hepatitis B virus) can decrease the production of neutrophils. So, you may see a below normal neutrophil count in a viral infection.'ve read the a bacterial infection can cause high WBC count, but a viral infection can cause a low WBC count. Why does the WBC go lower with a virus, but go higher with a bacterial infection. Well, maybe. You can actually see both high and low WBC counts with bacterial AND viral infections.