We found that Bam32-/- mice have impaired germinal centre B cell response starting from day 28 post-infection, a time that correlated with onset of uncontrolled parasitemia, hepatomegaly, splenomegaly and lower serum levels of IgG, IgG1 and IgG2a in infected Bam32-/- mice. Here, DAPP1 is linked to infection.