To determine if maternal IgA could bind GBS, we measured the amount of cross-reactivity maternal IgA had against various strains of GBS, COH1, and four clinical isolates of GBS from infant stool associated with late-onset sepsis.20 IgA from human milk readily bound GBS, including virulent COH1, and to differing degrees, clinical isolates from infant stool (Figure 2(c)). Here, VPS13B is linked to Sepsis.