Abstract
Epstein-Barr virus-infected Burkitt lymphoma cell cultures contain viral (V) and virus-induced, nonsedimentable, soluble (S) antigens which react in complement-fixation tests with certain human and subhuman primate sera containing antibodies to the V antigen. An apparently related soluble antigen was demonstrated in concentrated cell-free fluids of virus-free Raji cell cultures. Serologic evidence is presented to relate S antigens to EBV infections in man and subhuman primates. The release of S antigen by virus-free Raji and other lymphoid cell lines suggests the possible presence of a portion of the viral genome in some of these cells. Data on the physical properties of V and S antigens are presented.

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