“…According to Smith (I944) and Beloff and Gang (1945) this is probably fiom 12 to 2I days. Diagnosis Of a disease which is so uncommon and not proven to be a distinct clinical entity it is difficult to discuss the differential diagnosis but conditions which require consideration are infectious mononucleosis, acute leukaemia, diseases associated with high lymphocytosis and, in some cases, the surgical acute abdomen.…”