“…Although dramatic changes occur in the lymphoid organs as a result of a GVH reaction, relatively little is known about the immunological competence of an animal experiencing such a reaction. In situations where a GVH reaction existed it has been reported that allograft rejection in mice (Howard and Woodruff, 1961) and rabbits (Vrubel, 1961) as well as humoral antibody production in mice (Blaese, Martinez and Good, 1964) were impaired. Adoptively transferred immunity was also suppressed when the cells used to transfer immunity became engaged in a GVH reaction (Boyse, 1959;Goldstein, Skowron-Cendzrak and Wicher, 1965;Wakefield and Rose, 1968;Lawrence and Simonsen, 1967).…”