CD4 and brucellosis: In a study by Akbulut et al(15) investigating intracellular cytokines produced by Th1 and Th2 lymphocytes in brucellosis via flow cytometry, despite the lack of a significant difference in the level of CD4+‐IL4+ cells between the brucellosis and healthy controls, the levels of CD3+‐IL4+ cells in patients with brucellosis were lower than healthy subjects.