MUC5AC and infection: However, the mucins that did not bind J99ΔbabAΔsabA had a higher abundance of LacdiNAc than the mucins that bound J99ΔbabAΔsabA (p < 0.05), and no association was found between LacdiNAc abundance and binding within Leb-positive or Leb-negative samples, regardless of infection status (Fig. 9).