Fig. 4.

Relation between the helper CD4 T-cell count and NK cell IFN-γ production after coculture with iRBC. a Antiretroviral naïve HIV-1-infected people were grouped according to helper CD4 T-cell count (CD4 count): CD4 <200, 200 < CD4 ≤500, and CD4 >500. NK cell IFN-γ production in each group is shown; a Mann-Whitney test was used to compare means between groups (p < 0.05 considered as significant). * Expresses a significant difference. ** p < 0.01. *** p < 0.001. Groups with similar symbols express no significant difference. On the other hand groups with different symbols indicate a significant difference. b Positive correlation between NK cell IFN-γ production and CD4 count.