CD4 and infection: The analysis of lymphocyte populations from thymus showed the percents (4.5±1.5%) of CD4+CD8+ thymocytes in VK627- and rTsE627K-infected mice were far lower than the percents (82.3±4.3%) observed in rVK627E and TsE627 infection groups at day 5 p.i. (Fig. 4B).