The CFU counts remained stable at around 1010 CFU/mL for both strains at every condition tested, whereas the PFUs fluctuated slightly more: in what concerns the isolate K3574 co-adapted to the phage, PFU counts ranged from 109 PFU/mL at 1 day post-infection (dpi) to 107 PFU/mL at 15 dpi, whereas in the presence of mucin these counts reached 108 PFU/mL at 9 dpi, then slightly decreased till 107 PFU/mL at 15 dpi (Figure 3A), which corresponds to the 1:100 dilution performed every day along the experiment. Here, MUC5AC is linked to infection.