Although there was considerable variation between individual mice in both groups, we indeed observed a trend towards lower IFN-γ but higher IL-5 levels in sera of infected Ceacam1−/− mice, when compared to infected WT mice, as reflected by the lower IFN-γ to IL-5 ratios in Ceacam1−/− mice at days 6 and 8 after infection (Fig. 6B). The gene discussed is CEACAM1; the disease is infection.