A549 cell survival test
To ensure the safety of phage therapy, we investigated the
toxicity of crude isolated phages to A549 human lung epithelial
cells. A549 cells (105 cell well21) were plated in a 24-well ELISA
plate and incubated for 12 h (37uC, 5% CO2) in 100 ml per well of
Dulbecco’s modified Eagle medium (DMEM) (Sigma, D5523,
USA) supplemented with 5% fetal calf serum. Then, 106 CFU A.
baumannii KM18 were added to the cells, followed by thesurviving A549 cells suspended in trypsin solution were determined
by microscopic observation (Nikon, E2000, Japan).