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Isotype responses and risk of infection: odds ratio for IgG4 in the presence of interaction with IgG2 at P1 (solid bar) and P2 (dotted bar). The odds between the lowest IgG4 quintile (IgG4 = 1) and the highest IgG4 quintile (IgG4 = 5) are shown with 95% CI values for each IgG2 quintile. The odds were no longer significant when IgG2 levels were high (IgG2 = 4 and IgG2 = 5).
