“…It is now clear, however, that infection with EBV is both world-wide and very common-in particular, it appears fairly certain to be the cause of infectious mononucleosis (Henle et al, 1968). Antibody levels to EBV have also been shown to be very similar in the Kigezi highlands of south-western Uganda, where no cases of Burkitt's lymphoma occur (Burkitt and Wright, 1966), and elsewhere in Uganda (Henle, G. and Henle, W., unpublished observations on serum supplied by the East African Virus Research Institute and related workers).…”