LEP and infection: Increase mucosal leptin in the infected patients compare to uninfected patients.Amount of gastric leptin correlated positively with the mucosal levels of IL-1β and IL-6, but not IL-8 cytokine.Increase of gastric leptin expression during infection may have a local rather than systemic action.Increase in serum leptin concentration.Circulating leptin correlated with body mass index, but not with bacterial load.There was no change in plasma leptin levels following cure of the infection.