152 The Lymphocyte and Lymphocytic Tissue 



blood of similar cells has been recorded by others. 16, 12 Figure 1 1-5 illustrates 

 an atypical lymphocyte in the peripheral blood smear of a patient with 

 herpes zoster. 12,16 Figures 11-6 and 11-7 illustrate the atypical lymphocytes 

 iu the peripheral blood smear of patients with viral hepatitis. Litwins and 

 Lebowitz 12 record the presence of similar cells in 53 per cent of a series of 



Fig. 11-4. Primary viral pneumonitis, peripheral blood. Wright's stain, 

 (x 1700) 



55 patients with infectious hepatitis which they studied, and similar reports 

 have been made by others. 1 ' '■'■ ln ' 12, 14 - 1 



Although it would have been possible to select cells not as alike as the 

 ones illustrated, it must be admitted that, if the captions were intentionally 

 omit ted, it would be difficult to pick out which of these cases is infectious 

 mononucleosis and which is not. It is true that in general infectious mono- 

 nucleosis exhibits a greater percentage of virocytes in the peripheral blood 

 smear than do the other conditions listed. This is one of the features that 



