IL1B and infection: Again, similar to CHME-3 cells, increased mRNA expression of IL-1β (9.59-fold vs. 2.62-fold; p = 0.003) and IL-1α (7.47-fold vs. 4-fold; p = 0.008) was also observed by RPE cells infected with MDR-PA compared to cells challenged with an S-PA strain at a later time point of 6 h, and also compared to microglia cells, where increased expression was observed at 4 h post infection.