To test whether infection of the phages from the wild‐type PAO1 and ∆pfiT cells is both inhibited by Pf4r, the production of phage Pf4 was induced by overexpressing XisF4 via pHERD20T‐xisF4 in wild‐type PAO1 and ∆pfiT hosts. The gene discussed is SMOX; the disease is infection.