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
n.（名词） The presence of an abnormally large number of white blood cells with single nuclei in the bloodstream. 单细胞增多症：血液中单核白血细胞的异常增多 Infectious mononucleosis. 传染性单核细胞增多症
