As documented in Figure 5a and quantified in Figure 5b, infection by the Bp-WT strain significantly increased the amount of mucin accumulating in the tracheas of animals on day 5 of infection, when the CFU count of Bp-WT in the tracheas reached ~5.6 × 105 CFU/trachea (Figure 5c). The gene discussed is MUC5AC; the disease is infection.