Lymphopenia

Lymphopenia is the condition in which there exists an abnormally low number
of lymphocytes in the blood.

Lymphopenia can be caused by various types of chemotherapy, such as with
cytotoxic agents or immunosuppresive drugs. Some malignancies in the bone
marrow will also cause lymphopenia.

A decreased number of lymphocytes (notably T cells) is present in those with
AIDS. People exposed to large doses of radiation, such as those involved
with Chernobyl can also exhibit a lymphopenia.

Lymphopenia may be present as part of a pancytopenia, when all the blood
cells are of decreased number. This can occur in marrow failure.

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