CD79A and infection: Our previous work showed that IgA differences were most apparent in infection‐induced inflammation and only in the small intestine in ∆dblGATA‐1−/− mice of a BALB/c background.4 There may also be an effect of sex influencing IgA levels, as within our study only young, female eosinophil‐deficient mice had significantly higher levels of IgA in the serum compared with Het.