Although no significant effect was initially seen in the purified porcine mucin cultures (Fig. 5B), changing the timing of mucin exposure from preexposure to adding mucin at the time of infection also resulted in improved phage production (P = 0.03 at 24 h and P = 0.00006 at 48 h [Fig. 5C]). This evidence concerns the gene MUC5AC and infection.