Figure 1.

Kenyan adults exhibit higher proportions of CD56^neg NK cells, compared with U.S. adults. Flow cytometry was used to identify NK cell subsets in PBMCs from Kenyan adults (n = 31 QFT⁺; n = 30 QFT⁻) and U.S. adult healthy controls (U.S., n = 9). (A) Flow cytometry gating strategy for NK cells and CD56 subsets (CD56^neg, CD56^dim, CD56^bright). (B) Frequency of total NK cells as a percentage of lymphocytes. (C) Frequency of CD56 subsets as a proportion of total NK cells. Boxes in (B,C) represent the median and interquartile ranges; whiskers represent the 10th and 90th percentiles. Differences among groups were assessed using a Kruskal-Wallis test, with p-values adjusted for multiple comparisons using Dunn's post-test. ^*p < 0.05 and ^**p < 0.01.