Table 2: Free energy of adhesion of the four pathogens to polystyrene (PS) and to glass (GS) as a function of culture pH.

BacteriumpH GS

Aeromonas hydrophila6
7
8

Escherichia coli O157:H76
7
8

Salmonella Enteritidis6
7
8

Staphylococcus aureus6
7
8

PS and GS are the free energies of adhesion of the bacteria to polystyrene and glass, respectively.
In a column, for each given bacterium, values with the same letter are not significantly different