Does infectious mononucleosis cause lymphocytosis?

Yes. Glandular fever is a cause of lymphocytosis.

Glandular fever glandular fever glandular fever (an acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing) wikipedia.

Lymphocytosis lymphocytosis lymphocytosis, an increase in the number or proportion of lymphocytes in the blood, usually detected when a complete blood count is routinely obtained wikipedia.

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