Characterization of NK cell subsets in Kenyan children. Children were categorized by malaria and EBV exposure, as well as eBL diagnosis: Nandi (EBVlow/malarialow; n = 10), Kisumu (EBVhigh/malariahigh; n = 10), and eBL patients (n = 14) with no/low EBV and high EBV loads. (A) The percentage of NK cells within the circulating lymphocytes was defined as the number of NK cells (CD56pos and/or CD16pos)/total number of live lymphocytes. (B) Five NK cell subsets were defined by CD56 and CD16 expression levels: CD56brightCD16neg, CD56brightCD16pos, CD56dimCD16neg, CD56dimCD16pos, and CD56negCD16pos. (C) Percentages of NK cell subsets for each group of children within our study. (D) Representative proportions of NK cell subsets in different groups of children. Data in panels A and C are mean ± standard deviation (SD). *P < .05, **P < .01, ***P < .001.