CD27 and Burkitt lymphoma: Thus, it is notable that infants from a malaria- and Burkitt lymphoma-endemic region of western Kenya exhibit higher numbers of transitional B cells (CD10+CD34-), despite a normal distribution of naïve B cells (IgD+CD27-) and class-switched memory B cells (IgD-CD27+) [48], and also display higher EBV loads [49].