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. 2020 Aug 26;11:1947. doi: 10.3389/fmicb.2020.01947

FIGURE 1.

FIGURE 1

Scheme of the infection and treatment schedule. 1 × 103 bacterial cells are added at t = 0 h to a well seeded with 5 × 105 Calu-3 cells. After 6 h incubation PAO1 has reached approximately 106 CFU/well, at which time ciprofloxacin (CIP) or three different phages alone or in combination are added apically. Incubation is continued until 24 or 72 h, at which time point epithelial cell integrity (TER measurement), bacterial load (CFU) and phage titers (PFU) were determined.