Nonleukemic Lymphocytosis 155 



in infectious mononucleosis. In many of these cases, the cells were also 

 studied by phase microscopy and were found to have the same features as 

 those of cells in proved cases of infectious mononucleosis. 14 However, serial 

 serologic investigations revealed that only 4 of the 58 cases had antibodies 

 which were not absorbed by Forssman antigen and were absorbed by beef 



Fig. 11-7. Viral hepatitis, peripheral blood. Wright's stain, (x 1700) 



erythrocytes. Titres (after absorption) in these four cases were high and 

 definitely diagnostic (1:112, 1:448, 1:448, 1:896). In the other 54 cases there 

 was little if any elevation of nonspecific heterophil antibody and no increase 

 in heterophil antibody of the infectious mononucleosis type. We satisfied 

 ourselves that these results were not due to technical difficulties. There is no 

 doubt in my mind that this represents a disease similar to, but not the same 

 as, infectious mononucleosis. It is not likely, nor is it within the experience 

 of others, that there should be an epidemic of serologically negative cases of 

 infectious mononucleosis. 



