“…Since the first description of mononucleosis in glandular fever (Turk 1907) various reports of accompanying blood disorders have appeared in the literature. Thrombocytopenia (Minot 1929, Angle & Alt 1950, Bloom et al 1963, Chen et al 1968, haemolytic anaemia (Dameshek 1943, Bert6 1951, Hall & Archer 1953, Appleman & Gordon 1954, Dacie 1955, Jenkins & Marsh 1966 and severe neutropenia (Wechsler et al 1946, Wulff 1965, Carter 1966, Penman 1968) are among the usual haematological complications associated with infectious mononucleosis (I.M.). Earlier authors regarded pancytopenia as a very unusual finding.…”