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The percentage frequencies of antigen-specific memory B cells (of gated B cell population) in cell cultures after 5 days of stimulation of lymphocytes with deoxycytidyl-deoxyguanosine–oligodeoxynucleotide (CpG-ODN) 2006 (3 µg/ml), interleukin (IL)-2, IL-10 and IL-15 (10 ng/ml) and IL-21(100 ng/ml) in stringent otitis-prone (sOP) (n = 10) and non-otitis-prone (NOP) (n = 10) children. Bars represent mean values. P-values were calculated using the Mann–Whitney U-test.
