In the gentamicin protection assay, Salmonella
Typhimurium grown in LB-broth containing sub-MIC
concentrations of propionic acid, butyric acid, caprylic
acid or caproic acid, invaded significantly ( p 0.05)
less compared to Salmonella Typhimurium grown in
LB-broth not containing acids. Formic acid, acetic acid
and capric acid did not decrease invasion efficiency
( p > 0.05) at sub-MIC concentrations (Fig. 2).