Figure 2: Keratitis caused by the parent strain (A,C) and PLY deficient isogenic mutant strain (B,D). At 24 hours post-infection, there was more infiltrate in eyes infected with the parent strain (A) compared to eyes infected with the mutant strain (B). The clinical symptoms worsened by 48 hours post-infection and appeared more severe in eyes infected with the parent strain (C) than those infected with the mutant strain (D). Parent = K1263, Mutant = K1263ΔPLY. Black arrow indicates hypopyon.