Fig 2: (A) Testing the binding abilities of different polyclonal Abs with an in-house ELISA test with different amounts of intact E. coli cells as antigen. Black: Bio-Rad 4329-4906, white: Thermo Fisher PA1-7213, grey: Thermo Fisher PA1-73032. (B) The binding ability of a monoclonal Ab (Bio-Rad OBT0749) with an in-house ELISA test with different amounts of intact E. coli cells as antigen. For detection, biotinylated polyclonal Ab (Bio-Rad 4329-4906) was used. The inset shows the schematic drawing of the assay.